Is CVE-2026-27099 actively exploited?

No active exploitation of CVE-2026-27099 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27099 be exploited remotely?

Yes. CVE-2026-27099 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27099?

CVE-2026-27099 has a CVSS score of 8.0 (HIGH) and an EPSS exploitation probability of 0.04%.

HOME VULNERABILITIESCVE-2026-27099

HIGH

CVE-2026-27099

CWE-79Published: February 18, 2026· Updated: Feb 20, 2026

8.0

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27099 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.0.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.