CVE-2026-0300 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
CVSS-BT: 9.3
Description
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines by restricting access to only trusted internal IP addresses.
Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
https://security.paloaltonetworks.com/CVE-2026-0300
CVSS-BT: 9.3
Description
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines by restricting access to only trusted internal IP addresses.
Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
https://security.paloaltonetworks.com/CVE-2026-0300
Palo Alto Networks Product Security Assurance
CVE-2026-0300 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code wi...
Product Release Advisory - VMware Tanzu GemFire Management Console 1.4.4
Advisory ID: TNZ-2026-0260
Severity: Critical
Issue Date: 2026-05-05
Synopsis
Updated Spring, Tomcat and other libraries along with latest Prometheus version in OCI image with latest Photon image
VMware Tanzu Data Intelligence
VMware Tanzu Data Services Pack
VMware Tanzu Data Suite
VMware Tanzu Gemfire
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37439
Advisory ID: TNZ-2026-0260
Severity: Critical
Issue Date: 2026-05-05
Synopsis
Updated Spring, Tomcat and other libraries along with latest Prometheus version in OCI image with latest Photon image
VMware Tanzu Data Intelligence
VMware Tanzu Data Services Pack
VMware Tanzu Data Suite
VMware Tanzu Gemfire
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37439
SAP Security Patch Day - May 2026
https://support.sap.com/en/my-support/knowledge-base/security-notes-news/may-2026.html
https://support.sap.com/en/my-support/knowledge-base/security-notes-news/may-2026.html
Linux Kernel Vulnerability copy.fail - CVE-2026-31431
IR Number FG-IR-26-139
Published Date May 13, 2026
Component CLI
Severity High
Discovered Third-Party Library
Attack Type Authenticated
Known Exploited No
CVSSv3 Score 7.8
Impact Escalation of privilege
CVE ID CVE-2026-31431
https://fortiguard.fortinet.com/psirt/FG-IR-26-139
IR Number FG-IR-26-139
Published Date May 13, 2026
Component CLI
Severity High
Discovered Third-Party Library
Attack Type Authenticated
Known Exploited No
CVSSv3 Score 7.8
Impact Escalation of privilege
CVE ID CVE-2026-31431
https://fortiguard.fortinet.com/psirt/FG-IR-26-139
FortiGuard Labs
PSIRT | FortiGuard Labs
None
VMSA-2026-0003: VMware Fusion updates address privilege escalation vulnerability (CVE-2026-41702)
Advisory ID: VMSA-2026-0003
Advisory Severity: Important
CVSSv3 Range: 7.8
Synopsis: VMware Fusion updates address privilege escalation vulnerability (CVE-2026-41702)
Issue date: 2025-05-14
CVE(s) CVE-2026-41702
Impacted Products
VMware Fusion
Introduction
A local privilege escalation vulnerability in VMware Fusion was privately reported to Broadcom. Updates are available to remediate this vulnerability in affected Broadcom products.
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37454
Advisory ID: VMSA-2026-0003
Advisory Severity: Important
CVSSv3 Range: 7.8
Synopsis: VMware Fusion updates address privilege escalation vulnerability (CVE-2026-41702)
Issue date: 2025-05-14
CVE(s) CVE-2026-41702
Impacted Products
VMware Fusion
Introduction
A local privilege escalation vulnerability in VMware Fusion was privately reported to Broadcom. Updates are available to remediate this vulnerability in affected Broadcom products.
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37454
Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-42897
Released: May 14, 2026
Impact Spoofing
Max Severity Critical
Weakness CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 7.5
Executive Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
Publicly disclosed No
Exploited Yes
Exploitability assessment Exploitation Detected
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897
CVE-2026-42897
Released: May 14, 2026
Impact Spoofing
Max Severity Critical
Weakness CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 7.5
Executive Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
Publicly disclosed No
Exploited Yes
Exploitability assessment Exploitation Detected
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897
New Fragnesia Linux Kernel LPE Grants Root Access via Page Cache Corruption
Details have emerged about a new variant of the recent Dirty Frag Linux local privilege escalation (LPE) vulnerability that allows local attackers to gain root access, making it the third such bug to be identified in the kernel within a span of two weeks.
Codenamed Fragnesia, the security vulnerability is tracked as CVE-2026-46300 (CVSS score: 7.8) and is rooted in the Linux kernel's XFRM ESP-in-TCP subsystem. It was discovered by researcher William Bowling of Zellic and the V12 security team.
"The vulnerability allows unprivileged local attackers to modify read-only file contents in the kernel page cache and achieve root privileges through a deterministic page-cache corruption primitive," Google-owned Wiz said.
https://thehackernews.com/2026/05/new-fragnesia-linux-kernel-lpe-grants.html
Details have emerged about a new variant of the recent Dirty Frag Linux local privilege escalation (LPE) vulnerability that allows local attackers to gain root access, making it the third such bug to be identified in the kernel within a span of two weeks.
Codenamed Fragnesia, the security vulnerability is tracked as CVE-2026-46300 (CVSS score: 7.8) and is rooted in the Linux kernel's XFRM ESP-in-TCP subsystem. It was discovered by researcher William Bowling of Zellic and the V12 security team.
"The vulnerability allows unprivileged local attackers to modify read-only file contents in the kernel page cache and achieve root privileges through a deterministic page-cache corruption primitive," Google-owned Wiz said.
https://thehackernews.com/2026/05/new-fragnesia-linux-kernel-lpe-grants.html
K000161019: NGINX ngx_http_rewrite_module vulnerability CVE-2026-42945
Date: May 13, 2026
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 0.6.27-1.30.0
Security Advisory Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. (CVE-2026-42945)
https://my.f5.com/manage/s/article/K000161019
Date: May 13, 2026
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 0.6.27-1.30.0
Security Advisory Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR ) disabled, code execution is possible. (CVE-2026-42945)
https://my.f5.com/manage/s/article/K000161019
F5
NGINX ngx_http_rewrite_module vulnerability CVE-2026-42945
Security Advisory Description NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular…
K000161131: NGINX ngx_http_proxy_v2_module vulnerability CVE-2026-42926
Security Advisory Description
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. (CVE-2026-42926)
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 1.29.4-1.30.0
https://my.f5.com/manage/s/article/K000161131
Security Advisory Description
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. (CVE-2026-42926)
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 1.29.4-1.30.0
https://my.f5.com/manage/s/article/K000161131
F5
NGINX ngx_http_proxy_v2_module vulnerability CVE-2026-42926
Security Advisory Description When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. (CVE-2026…
K000161027: NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability CVE-2026-42946
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 0.8.42-1.30.0
Security Advisory Description
A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. (CVE-2026-42946)
Impact
This vulnerability may allow remote attackers to restart or disclose the memory of the NGINX worker process. There is no control plane exposure; this is a data plane issue only.
https://my.f5.com/manage/s/article/K000161027
Not vulnerable: 1.31.0+, 1.30.1+
Vulnerable: 0.8.42-1.30.0
Security Advisory Description
A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it. (CVE-2026-42946)
Impact
This vulnerability may allow remote attackers to restart or disclose the memory of the NGINX worker process. There is no control plane exposure; this is a data plane issue only.
https://my.f5.com/manage/s/article/K000161027
F5
NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability CVE-2026-42946
Security Advisory Description A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker…
Upcoming highly critical release on May 20, 2026 - PSA-2026-05-18
Date: 2026-May-18
Security risk: Highly critical
Description:
There will be a Drupal core security release for all supported branches on May 20, 2026, between 17:00 and 21:00 UTC. (To see this in your local timezone, refer to the Drupal Core Calendar.) The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days.
Supported core versions
Security releases will be provided for all the currently supported branches of Drupal core, which are:
11.3.x
11.2.x
10.6.x
10.5.x
Sites on one of these supported versions should update to the latest patch release for the given branch now in preparation for the security window.
https://www.drupal.org/psa-2026-05-18
Date: 2026-May-18
Security risk: Highly critical
Description:
There will be a Drupal core security release for all supported branches on May 20, 2026, between 17:00 and 21:00 UTC. (To see this in your local timezone, refer to the Drupal Core Calendar.) The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days.
Supported core versions
Security releases will be provided for all the currently supported branches of Drupal core, which are:
11.3.x
11.2.x
10.6.x
10.5.x
Sites on one of these supported versions should update to the latest patch release for the given branch now in preparation for the security window.
https://www.drupal.org/psa-2026-05-18
Drupal.org
Upcoming highly critical release on May 20, 2026 - PSA-2026-05-18
There will be a Drupal core security release for all supported branches on May 20, 2026, between 17:00 and 21:00 UTC. (To see this in your local timezone, refer to the Drupal Core Calendar.) The Drupal Security Team urges you to reserve time for core updates…
GitHub Internal Repositories Breached via Malicious Nx Console VS Code Extension
https://thehackernews.com/2026/05/github-internal-repositories-breached.html
https://thehackernews.com/2026/05/github-internal-repositories-breached.html
Cisco Secure Workload Unauthorized API Access Vulnerability
Advisory ID: cisco-sa-csw-pnbsa-g8WEnuy
First Published: 2026 May 20 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwt99942
CVSS Score: Base 10.0
Summary
A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to access site resources with the privileges of the Site Admin role.
This vulnerability is due to insufficient validation and authentication when accessing REST API endpoints. An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint. A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-csw-pnbsa-g8WEnuy
Advisory ID: cisco-sa-csw-pnbsa-g8WEnuy
First Published: 2026 May 20 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwt99942
CVSS Score: Base 10.0
Summary
A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to access site resources with the privileges of the Site Admin role.
This vulnerability is due to insufficient validation and authentication when accessing REST API endpoints. An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint. A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-csw-pnbsa-g8WEnuy
Cisco
Cisco Security Advisory: Cisco Secure Workload Unauthorized API Access Vulnerability
A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to access site resources with the privileges of the Site Admin role.
This vulnerability is due to insufficient validation…
This vulnerability is due to insufficient validation…
Validación de entrada incorrecta en el servidor de UniFI OS
Fecha 22/05/2026
Importancia 5 - Crítica
https://www.incibe.es/incibe-cert/alerta-temprana/avisos/validacion-de-entrada-incorrecta-en-el-servidor-de-unifi-os
Fecha 22/05/2026
Importancia 5 - Crítica
https://www.incibe.es/incibe-cert/alerta-temprana/avisos/validacion-de-entrada-incorrecta-en-el-servidor-de-unifi-os
www.incibe.es
Validación de entrada incorrecta en el servidor de UniFI OS
UniFi ha publicado 5 vulnerabilidades: 4 de severidad crítica y 1 de severidad alta que, en caso de se