Security readout for executives and security teams
Plain-English summary
This vulnerability affects Jenkins Groovy Postbuild Plugin 2.3.1 and older. A user who can control build badge content could store JavaScript that later runs in another Jenkins user's browser during certain UI actions. The main business risk is compromise of Jenkins user sessions or misleading CI/CD interface behavior.
Executive priority
Treat this as a targeted Jenkins hygiene issue. Prioritize environments where Jenkins is internet-accessible, broadly shared, or connected to production deployment workflows. It is not listed as actively exploited in the supplied evidence.
Technical view
CVE-2018-1000202 is a persisted cross-site scripting issue in multiple Jelly files in Jenkins Groovy Postbuild Plugin 2.3.1 and earlier. The required attacker capability is control over build badge content. Execution occurs when another user interacts with affected Jenkins UI paths. The provided sources do not include CVSS, CWE, or patch-version detail.
Likely exposure
Exposure is likely limited to Jenkins installations with Groovy Postbuild Plugin 2.3.1 or older, especially where non-administrative users, job authors, or build processes can influence badge content.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires the ability to persist malicious badge content and a second user triggering affected UI behavior in Jenkins.
Researcher notes
The available evidence identifies the vulnerable plugin, version boundary, trigger condition, and XSS class, but omits CVSS, CWE, detailed affected product metadata, and explicit remediation version. Avoid assuming exploit availability or specific fixes beyond Jenkins advisory guidance.
Mitigation direction
- Inventory Jenkins instances for Groovy Postbuild Plugin usage and versions.
- Check Jenkins advisory SECURITY-821 and plugin guidance for the fixed upgrade path.
- Upgrade or remove the plugin where affected versions are present.
- Restrict who can configure jobs or control build badge content.
- Review Jenkins permissions for job authors and build metadata writers.
Validation and detection
- Confirm whether Groovy Postbuild Plugin is installed on each Jenkins controller.
- Verify installed plugin versions are newer than 2.3.1 or otherwise vendor-approved.
- Identify jobs that create or modify build badges through this plugin.
- Review stored badge content for unexpected script-capable HTML.
- Check Jenkins logs for suspicious job configuration or badge changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-1000202 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://jenkins.io/security/advisory/2018-05-09/#SECURITY-821CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.