What is CVE-2026-42523?

CVE-2026-42523 is a critical-severity vulnerability in Jenkins Github, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-04-29.

How severe is CVE-2026-42523?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Jenkins Github

CVE-2026-42523

Jenkins GitHub Plugin 1.46.0 and earlier improperly processes the current job URL as part of JavaScript implementing validation of the feature "GitHub hook trigger for GITScm polling", resulting in a stored cross-site scripting (XSS) vulne…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (15.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Jenkins Github
Jenkins Project Github Plugin — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Jenkins Security Advisory 2026-04-29 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42523?: CVE-2026-42523 is a critical-severity vulnerability in Jenkins Github, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-04-29.
How severe is CVE-2026-42523?: Critical severity. CVSS v3 base score is 9.0 out of 10.