---
title: "CVE-2026-42523: Jenkins GitHub Plugin has an XSS vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-42523/
description: "CVE-2026-42523 (com.coravy.hudson.plugins.github:github (Maven)): Jenkins GitHub Plugin 1.46.0 and earlier improperly processes the current job URL as part…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-29
date_modified: 2026-08-14
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-42523"
kev: false
cvss: 9
epss: 0.00495
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-42523: Jenkins GitHub Plugin has an XSS vulnerability

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes com.coravy.hudson.plugins.github:github (Maven) < 1.46.0.1, fixed in 1.46.0.1 . Check your lockfile, including transitive dependencies.

## What it is

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) vulnerability exploitable by non-anonymous attackers with Overall/Read permission.

## Affected packages

- Maven `com.coravy.hudson.plugins.github:github` < 1.46.0.1 → fixed: 1.46.0.1

## Affected products (CVE record)

- Jenkins Project Jenkins GitHub Plugin: <= 1.46.0

## Severity

- CISA-ADP CVSS 3.1: 9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.0 `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.50% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [Jenkins Security Advisory 2026-04-29](https://www.jenkins.io/security/advisory/2026-04-29/#SECURITY-3704)
- [GitHub Advisory GHSA-w22p-4x9f-486v](https://github.com/advisories/GHSA-w22p-4x9f-486v)
- [CVE.org record CVE-2026-42523](https://www.cve.org/CVERecord?id=CVE-2026-42523)
- [NVD entry CVE-2026-42523](https://nvd.nist.gov/vuln/detail/CVE-2026-42523)

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Source page: https://erroneo.us/security/cve/CVE-2026-42523/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt