CVE-2026-27099
HIGHorg.jenkins-ci.main/jenkins-core: Jenkins: Stored Cross-site Scripting (XSS) via unescaped user-provided offline cause description
CVSS v3
8
HIGH
EPSS Score
0.1%
exploit probability
CISA KEV
No
known exploited
Exploitation
none
SSVC status
Description
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.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 2/18/2026
- Last Modified
- 2/20/2026
Frequently Asked Questions
What is CVE-2026-27099?
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.
Is CVE-2026-27099 actively exploited?
Active exploitation of CVE-2026-27099 has not been confirmed. The EPSS score is 0.1%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-27099?
CVE-2026-27099 has a CVSS v3 base score of 8 (HIGH severity), with vector string 3.1.
Is CVE-2026-27099 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.