What is CVE-2026-84648?

CVE-2026-84648 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-02.

How severe is CVE-2026-84648?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-84648

CVE-2026-84648

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in control of agent processes.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84648?: CVE-2026-84648 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-09-02.
How severe is CVE-2026-84648?: High severity. CVSS v3 base score is 8.8 out of 10.