GHSA-g2xq-2v27-4rh3

Jenkins arbitrary type deserialization from attacker-controlled config.xml allows remote code execution and user impersonation

At a glance

Published: 2026-06-10 15:31 UTC
Updated: 2026-09-10 03:50 UTC
CVE: CVE-2026-53435
Aliases: BIT-jenkins-2026-53435
CVSS_V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards. This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary files from the Jenkins controller.

Affected packages

Package	Versions
Maven · org.jenkins-ci.main:jenkins-core	introduced 0, fixed 2.555.3
Maven · org.jenkins-ci.main:jenkins-core	introduced 2.556, fixed 2.568

References

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — GitHub Advisory Database