CVE-2026-57304 Jenkins Assembla Plugin has a missing permission check

Medium 5.4 Published 24 Jun 2026 Updated 24 Jun 2026

Attackers with read access can connect to arbitrary URLs using specified credentials due to missing permission checks in the Jenkins Assembla Plugin.

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-2026-57304?

CVE-2026-57304 is a medium-severity missing authorization 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

A missing permission check in Jenkins Assembla Plugin 1.4 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using an attacker-specified username and password.

Weakness: CWE-862

Which versions are affected by CVE-2026-57304?

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-2026-57304?

No fix has been published for CVE-2026-57304 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-57304 being exploited?

There is no known exploitation of CVE-2026-57304 in the wild and no public exploit code.

Sources

Also known as GHSA-2r5w-jh6g-8hff.