Threat Advisory

Jenkins Credentials Binding Plugin Vulnerabilities Exploited

Threat: Vulnerability
Targeted Region: Global
Targeted Sector: Technology & IT
Criticality: High
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EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in Jenkins plugins, specifically Credentials Binding, GitHub, and HTML Publisher plugins. The vulnerabilities affect various versions, leading to remote code execution, stored cross-site scripting (XSS), and path traversal issues. These flaws pose a significant business risk as they can compromise thousands of CI/CD environments, potentially resulting in data breaches, system downtime, and reputational damage. The advisory highlights the importance of prompt action to mitigate these risks and prevent potential attacks.[/subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in Jenkins plugins, specifically Credentials Binding, GitHub, and HTML Publisher plugins. The vulnerabilities affect various versions, leading to remote code execution, stored cross-site scripting (XSS), and path traversal issues. These flaws pose a significant business risk as they can compromise thousands of CI/CD environments, potentially resulting in data breaches, system downtime, and reputational damage. The advisory highlights the importance of prompt action to mitigate these risks and prevent potential attacks.[emaillocker id="1283"]

  • CVE-2026-42520 with a CVSS score of 8.8 - A "High" severity path traversal flaw exists because the Credentials Binding plugin fails to sanitize file names for zip or file credentials, allowing an attacker to execute remote code execution via job configuration on a built-in node.
  • CVE-2026-42523 with a CVSS score of 7.5 - Attackers with "Overall/Read" permissions can exploit improper processing of job URLs in the GitHub plugin to execute malicious JavaScript via stored XSS.
  • CVE-2026-42524 with a CVSS score of 7.5 - Attackers with "Item/Configure" permissions can exploit the failure to escape job names and URLs in legacy wrapper files in the HTML Publisher plugin to launch stored XSS attacks.

The identified vulnerabilities pose a high risk to business operations, as they can lead to system compromise, data breaches, and reputational damage. Immediate action is required to mitigate these risks and prevent potential attacks. The consequences of exploitation can be severe, including financial loss, loss of customer trust, and damage to business reputation.

RECOMMENDATION:

We recommend you to update Jenkins plugins to below version:

  • Credentials Binding Plugin to version 720.v3f6decef43ea or later
  • GitHub Plugin to version 1.46.0.1 or later
  • HTML Publisher Plugin to version 427.1 or later
  • Matrix Authorization Strategy Plugin to version 3.2.10 or later
  • Microsoft Entra ID Plugin to version 667.v4c5827a_e74a_0 or later.

REFERENCES:

The following reports contain further technical details:
https://securityonline.info/jenkins-security-advisory-plugin-rce-xss-fixes-2026/

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