Info Disclosure via Unchecked Run Parameter in Jenkins 2.550
CVE-2026-27100 Published on February 18, 2026
Jenkins 2.550 and earlier, LTS 2.541.1 and earlier accepts Run Parameter values that refer to builds the user submitting the build does not have access to, allowing attackers with Item/Build and Item/Configure permission to obtain information about the existence of jobs, the existence of builds, and if a specified build exists, its display name.
Vulnerability Analysis
CVE-2026-27100 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-27100 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-27100
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Affected Versions
Jenkins Project Jenkins:- Version 2.551 and below * is unaffected.
- Version 2.541.2 and below 2.541.* is unaffected.
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.