Gitlab AuthenticationApplication · Jenkins
CVE-2020-2228
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedJenkins Gitlab Authentication Plugin 1.5 and earlier does not perform group authorization checks properly, resulting in a privilege escalation vulnerability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Jenkins Gitlab Authentication Plugin versions 1.5 and earlier fails to properly perform group-based authorization checks, allowing authenticated users to bypass intended permission boundaries and escalate privileges beyond what their group memberships should permit.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Gitlab AuthenticationApplication
<= 1.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Gitlab Authentication Plugin is installedNavigate to Manage Jenkins > Manage Plugins > Installed tab and search for Gitlab Authentication Plugin, or inspect the plugin directory (JENKINS_HOME/plugins) for a gitlab-auth-plugin folderAffected if The plugin is present in the Jenkins installation
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Check the installed plugin versionIn the Jenkins UI plugin list, locate Gitlab Authentication Plugin and note the version number displayed in the version column; alternatively, examine the plugin's MANIFEST.MF file inside the plugin archiveAffected if Version is 1.5 or earlier (versions prior to 1.6)
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Verify group-based authorization is in useGo to Manage Jenkins > Configure Global Security and examine the Security Realm setting - confirm Gitlab Authentication is enabled AND that group/team membership from Gitlab is being used for authorization (look for Gitlab group mappings in authorization matrix or role-based settings)Affected if Gitlab Authentication is set as the Security Realm with Gitlab group memberships actively used for permission assignment
You are affected if the Gitlab Authentication Plugin version 1.5 or earlier is installed AND group-based authorization using Gitlab groups is configured and active in your Jenkins security settings.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade the Jenkins Gitlab Authentication Plugin to version 1.6 or later to obtain the fixed authorization logic, and verify that group-based permissions function correctly after the update.
Fix this in Gitlab Authentication
Scoped from the published advisory
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,936.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-2228 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-2228 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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