What is CVE-2023-4303?

CVE-2023-4303 is a medium-severity vulnerability in Jenkins Fortify, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-08-21.

How severe is CVE-2023-4303?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Jenkins Fortify

CVE-2023-4303

Jenkins Fortify Plugin 22.1.38 and earlier does not escape the error message for a form validation method, resulting in an HTML injection vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-08-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Jenkins Fortify
Jenkins Project Fortify Plugin — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.jenkins.io/security/advisory/2023-08-16/ (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-4303?: CVE-2023-4303 is a medium-severity vulnerability in Jenkins Fortify, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2023-08-21.
How severe is CVE-2023-4303?: Medium severity. CVSS v3 base score is 4.3 out of 10.