CVE-2026-57303 Jenkins Assembla Plugin has an XXE vulnerability
Attackers controlling Assembla server responses can exploit XXE to extract Jenkins secrets or perform SSRF.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-57303?
CVE-2026-57303 is a high-severity vulnerability in Jenkins Assembla Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks, allowing attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery.
Weakness: CWE-918
Which versions are affected by CVE-2026-57303?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:assembla. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:assembla Maven | All versions to 1.4 | None |
org.jenkins-ci.plugins:assembla Maven | All versions to 1.4 | None |
Products include Jenkins Assembla.
How do I fix CVE-2026-57303?
No fix has been published for CVE-2026-57303 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-57303 being exploited?
There is no known exploitation of CVE-2026-57303 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Assembla Plugin
- CVE-2023-37961 Jenkins Assembla Auth Plugin vulnerable to cross-site request forgery
- CVE-2019-10420 Jenkins Assembla Plugin has Insufficiently Protected Credentials
- CVE-2026-57304 Jenkins Assembla Plugin has a missing permission check
- CVE-2026-57305 Jenkins Assembla Plugin has a cross-site request forgery (CSRF) vulnerability
Sources
Also known as GHSA-2q27-6p2h-q6r3.