Jenkins Groovy Libs Plugin: Symlink Exploit Allows Arbitrary File Read
CVE-2026-48921 Published on May 27, 2026
Jenkins Pipeline: Groovy Libraries Plugin 797.v90ea_a_9b_e45a_0 and earlier does not prohibit symbolic links in shared libraries, allowing attackers able to control the content of a library used by a Pipeline job to read arbitrary files on the Jenkins controller filesystem.
Vulnerability Analysis
CVE-2026-48921 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-48921 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-48921
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Affected Versions
Jenkins Project Jenkins Pipeline: Groovy Libraries Plugin:- Before and including 797.v90ea_a_9b_e45a_0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.