CVE-2026-27099

Jenkins has a stored XSS vulnerability in node offline cause description

8.0 HighFix available

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.48%Up 0.4 points since Feb 19, 2026

What each source reports

CVE List Score used 8.0

Record: CVE-2026-27099
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-8091 8.0

Record: EUVD-2026-8091
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-85h6-5m3v-gx37 8.0

Jenkins has a stored XSS vulnerability in node offline cause description

Record: GHSA-85h6-5m3v-gx37
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

NVD 8.0

Record: CVE-2026-27099
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

OSV 8.0

Record: CVE-2026-27099
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-85h6-5m3v-gx37 8.0

Jenkins has a stored XSS vulnerability in node offline cause description

Record: GHSA-85h6-5m3v-gx37
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

OSVROOT-APP-MAVEN-CVE-2026-27099 8.0

CVE-2026-27099 in io.root.org.jenkins-ci.main:jenkins-core - Patched by Root

Root has patched CVE-2026-27099 in the io.root.org.jenkins-ci.main:jenkins-core package for Root:Maven. Multiple fixed versions available.

Record: ROOT-APP-MAVEN-CVE-2026-27099
CVSS 3.1: 8.0 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVBIT-jenkins-2026-27099 No score

Record: BIT-jenkins-2026-27099
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.jenkins-ci.main:jenkins-core` Maven	2.542 up to 2.551	2.551
`org.jenkins-ci.main:jenkins-core` Maven	2.483 up to 2.541.2	2.541.2
`jenkins` Bitnami	2.483.0 up to 2.541.2, 2.542.0 up to 2.551.0	2.541.22.551.0
`org.jenkins-ci.main:jenkins-core` Maven	2.542 up to 2.551, plus listed versions 2.5432.5442.5452.5462.5472.5482.5492.550	2.551
`org.jenkins-ci.main:jenkins-core` Maven	2.483 up to 2.541.2, plus listed versions 2.4842.4852.4862.4872.488 Show 45 moreShow less 2.4892.4902.4912.4922.492.12.492.22.492.32.4932.4942.4952.4962.4972.4982.4992.5002.5012.5022.5032.5042.504.12.504.22.504.32.5052.5062.5072.5082.5092.5102.5112.5122.5132.5142.5152.5162.516.12.516.22.516.32.5172.5182.5192.5202.5212.5222.5232.524	2.541.2
`io.root.org.jenkins-ci.main:jenkins-core` Root:Maven	before 2.533-root.io.1	2.533-root.io.12.533-root.io.22.533-root.io.32.540-root.io.12.533-root.io.42.540-root.io.22.533-root.io.62.540-root.io.32.540-root.io.4
`org.jenkins-ci.main:jenkins-core` Root:Maven	before 2.540-aikido.4	2.540-aikido.4

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-27099 is a high vulnerability (CVSS 8.0) in Jenkins, published February 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in org.jenkins-ci.main:jenkins-core 2.551.

References

This page doesn't list everything

Left out here: 21 versions. The JSON record has them.