Stored cross-site scripting in Jenkins and Jenkins LTS - CVE-2026-84648
Published: September 4, 2026
Vulnerability identifier: #VU146888
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-84648
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in system log viewer. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Jenkins
Jenkins LTS
Jenkins LTS
How to mitigate CVE-2026-84648
Install updates from vendor's website.
Jenkins - update to 2.580
Jenkins LTS - update to 2.568.3
Jenkins LTS - update to 2.568.3