Listen to this Post
This vulnerability arises from a missing permission check in Jenkins’ view rendering mechanism. In affected versions, when a view is displayed that contains password fields, such as those used in credentials or configuration, the system fails to verify if the user has appropriate permissions to view encrypted password values. Typically, encrypted passwords are stored in Jenkins’ credentials store and should only be accessible to users with explicit Manage or Configure permissions. However, due to this flaw, any attacker with View or Read permission on a view can retrieve the encrypted password strings. The vulnerability exploits the way Jenkins handles the rendering of form elements in views, where password field values are inadvertently exposed in the HTML or through API responses. Attackers can leverage this by accessing specific URLs or endpoints that display views containing password fields. The encrypted passwords, while not in plaintext, could be subjected to offline decryption attempts if the encryption keys are compromised or through brute-force attacks. Additionally, in some configurations, these encrypted values might be used in other parts of the system, potentially leading to further escalation. The issue is particularly critical in multi-user environments where view permissions are loosely assigned. The vulnerability affects the main Jenkins line from version 2.529 up to 2.540, and the LTS line up to 2.528.2. Patches have been released in versions 2.541 and 2.528.3, which introduce proper permission checks before displaying any password-related data.
Platform: Jenkins
Version: 2.540 and earlier
Vulnerability: Missing permission check
Severity: Moderate
Date: Dec 10, 2025
Prediction: Patched Dec 10, 2025
What Undercode Say:
Showing bash commands and codes related to the blog
curl -X GET http://jenkins-host/view/All/api/json?tree=jobs[name,properties[bash]]
grep -r “encryptedPassword” Jenkins_home/
python3 exploit_jenkins_view.py
how Exploit:
Attacker with View permission accesses views containing password fields via crafted URLs or scripts, extracting encrypted passwords from HTML or JSON responses.
Protection from this CVE
Update to Jenkins 2.541 or 2.528.3; restrict View permissions; audit user access.
Impact:
Unauthorized viewing of encrypted passwords, potential credential decryption, security bypass.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
