What is CVE-2026-27100?

CVE-2026-27100 is a medium-severity vulnerability in Jenkins, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-02-18.

How severe is CVE-2026-27100?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Information disclosure in Jenkins

CVE-2026-27100

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 class: Information Disclosure

EPSS: 0.003 (25.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Jenkins
Jenkins Project — versions 2.551, 2.541.2

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

jenkinsci-cert@googlegroups.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-27100?: CVE-2026-27100 is a medium-severity vulnerability in Jenkins, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-02-18.
How severe is CVE-2026-27100?: Medium severity. CVSS v3 base score is 4.3 out of 10.