What is CVE-2023-43495?

CVE-2023-43495 is a medium-severity vulnerability in Jenkins, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-20.

How severe is CVE-2023-43495?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Jenkins

CVE-2023-43495

Jenkins 2.423 and earlier, LTS 2.414.1 and earlier does not escape the value of the 'caption' constructor parameter of 'ExpandableDetailsNote', resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to control this parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001

Affected products

Jenkins
Jenkins Project — versions 2.424, 2.414.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.jenkins.io/security/advisory/2023-09-20/ (vendor-advisory, Vendor Advisory)
www.openwall.com/lists/oss-security/2023/09/20/5 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2023-43495?: CVE-2023-43495 is a medium-severity vulnerability in Jenkins, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-20.
How severe is CVE-2023-43495?: Medium severity. CVSS v3 base score is 5.4 out of 10.