CVE-2026-42523 Jenkins GitHub Plugin has an XSS vulnerability
Stored XSS in Jenkins GitHub Plugin allows attackers with Read permission to execute scripts via job URLs, potentially compromising user accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-42523?
CVE-2026-42523 is a critical cross-site scripting vulnerability in Jenkins GitHub Plugin, published on 29 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-42523?
2 open source packages ship an affected version, including com.coravy.hudson.plugins.github:github. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.coravy.hudson.plugins.github:github Maven | All versions | 1.46.0.1 |
com.coravy.hudson.plugins.github:github Maven | All versions | 1.46.0.1 |
Products include Jenkins Github.
How do I fix CVE-2026-42523?
Upgrade com.coravy.hudson.plugins.github:github to 1.46.0.1 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-42523 being exploited?
There is no known exploitation of CVE-2026-42523 in the wild and no public exploit code.
Other vulnerabilities in Jenkins GitHub Plugin
- CVE-2018-1000600 CSRF vulnerability and missing permission checks in GitHub Plugin allowed capturing credentials
- CVE-2018-1000183 Jenkins GitHub Plugin exposure of sensitive information vulnerability exists
- CVE-2023-46650 Stored XSS vulnerability in Jenkins GitHub Plugin
- CVE-2018-1000184 Jenkins GitHub Plugin server-side request forgery vulnerability exists
- CVE-2022-36885 Jenkins GitHub plugin uses weak webhook signature function
Sources
Also known as GHSA-w22p-4x9f-486v.