Repository ConnectorApplication · Jenkins
CVE-2021-21618
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 Repository Connector Plugin 2.0.2 and earlier does not escape parameter names and descriptions for past builds, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.
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 Repository Connector Plugin versions 2.0.2 and earlier fails to escape parameter names and descriptions when displaying past builds. This allows an authenticated attacker with Item/Configure permission to inject malicious JavaScript into build parameters, which executes when other users view those past builds.
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
Repository ConnectorApplication
<= 2.0.2CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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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Verify Repository Connector Plugin is installedNavigate to Manage Jenkins > Manage Plugins > Installed tab and search for 'Repository Connector', or check the file $JENKINS_HOME/plugins/repository-connector.jpi for existenceAffected if The plugin is present on the Jenkins controller
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Check installed plugin versionIn the Installed Plugins tab, find the Version column for Repository Connector Plugin, or read the MANIFEST.MF file inside the plugin archiveAffected if Version is 2.0.2 or earlier (or if version cannot be determined but plugin is installed)
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Review builds using Repository Connector parametersNavigate to Jenkins > [your job] > Builds > [past build number] > Parameters and inspect the displayed parameter names and descriptions for any unescaped HTML or script contentAffected if Past builds exist that were triggered with Repository Connector plugin parameters and show unsanitized content in parameter names or descriptions
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Audit Item/Configure permission assignmentsGo to Manage Jenkins > Manage Users and check which users or groups have Item/Configure permission on jobs, or review job-level security settings in Configure > AuthorizationAffected if Users with Item/Configure permission include untrusted or non-admin accounts
If the Repository Connector Plugin version is 2.0.2 or earlier AND past builds with plugin-generated parameters exist, the environment is affected by this XSS vulnerability.
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 Repository Connector Plugin to version 2.0.3 or later, which contains the fix for proper HTML escaping of parameter values. As a compensating control, restrict Item/Configure permission to trusted users only.
Fix this in Repository Connector
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 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 $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21618 — 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-2021-21618 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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