CVE-2026-27100 Jenkins has a build information disclosure vulnerability through Run Parameter

What is CVE-2026-27100?

CVE-2026-27100 is a medium-severity vulnerability in Jenkins Jenkins, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-200

Which versions are affected by CVE-2026-27100?

5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.

Products include Jenkins Jenkins.

How do I fix CVE-2026-27100?

Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.541.2 or 2.551.

Is CVE-2026-27100 being exploited?

There is no known exploitation of CVE-2026-27100 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Jenkins

• CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Exploited Critical 9.8
• CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2017-1000353 Jenkins Remote Code Execution Exploited Critical 9.8
• CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Exploited High 7.5
• CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins Critical 9.8

All Jenkins Jenkins vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-jenkins-2026-27100, GHSA-wfhp-qgm8-5p5c, MINI-4xf3-9g5f-7gf6, MINI-6852-fgrf-4hwg, MINI-9vpw-gcgh-m77h, MINI-rcv9-rg56-6chh and 3 more.