Jenkins Stapler <2107 (except 2088.2093) allows global config via form
CVE-2026-84654 Published on September 2, 2026
In Stapler 2107.v8dfcb_e8ed317 and earlier, except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, form data binding allows setting public static fields of the bound configuration object, allowing attackers who can submit configuration forms to modify public static fields of the configuration objects those forms are bound to, resulting in changes that apply globally to the Jenkins instance.
Vulnerability Analysis
CVE-2026-84654 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an Assumed-Immutable Parameter Tampering Vulnerability?
The web application does not sufficiently verify inputs that are assumed to be immutable but are actually externally controllable, such as hidden form fields.
CVE-2026-84654 has been classified to as an Assumed-Immutable Parameter Tampering vulnerability or weakness.
Products Associated with CVE-2026-84654
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Affected Versions
Jenkins Project Jenkins:- Version 2.580 and below * is unaffected.
- Version 2.568.3 and below 2.568.* is unaffected.