Full Report
Jenkins security advisory (AV26-515)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Jenkins Plugins (AV26-515)
## CVE Details
*Note: While the specific CVE IDs for each plugin were not enumerated in the summary provided, Jenkins advisories of this nature typically contain multiple identifiers ranging from Medium to High severity (CVSS 4.3 - 8.8).*
- **CVE ID**: Multiple (Refer to Jenkins Advisory 2026-05-27)
- **CVSS Score**: Varies by plugin (Typically High/Medium)
- **CWE**: Various (Commonly including CWE-79: XSS, CWE-862: Missing Authorization, and CWE-522: Insufficiently Protected Credentials)
## Affected Systems
- **Products**: Various Jenkins Plugins
- **Versions**:
- Active Directory Plugin: 2.4.1 and prior
- AppSpider Plugin: 1.0.17 and prior
- Bitbucket OAuth Plugin: 0.17 and prior
- buildgraph-view Plugin: 1.8 and prior
- Credentials Binding Plugin: 720.v3f6decef43ea_ and prior
- Email Extension Plugin: 1933.v45cec755423f and prior
- GitHub Integration Plugin: 0.7.3 and prior
- Job Import Plugin: 143.v044a_2e819b_27 and prior
- LDAP Plugin: 807.v7d7de30930cf and prior
- Pipeline: Groovy Libraries Plugin: 797.v90ea_a_9b_e45a_0 and prior
- Multijob Plugin: 662.vd2e0001f6b_b_d and prior
- **Configurations**: Jenkins instances with these plugins installed and enabled.
## Vulnerability Description
This advisory covers a collection of security flaws across the Jenkins ecosystem. Typical vulnerabilities in these specific sets of plugins often include:
1. **Credential Leaks**: Insecure storage or masking of credentials in build logs (Credentials Binding, Email Extension).
2. **Cross-Site Scripting (XSS)**: Improper sanitization of user-controlled input in UI views (buildgraph-view, Multijob).
3. **Improper Authentication/Authorization**: Flaws in how external identity providers are integrated (Active Directory, LDAP, Bitbucket OAuth).
## Exploitation
- **Status**: Not currently reported as exploited in the wild; PoC typically follows shortly after Jenkins advisories.
- **Complexity**: Low to Medium
- **Attack Vector**: Network
## Impact
- **Confidentiality**: High (Potential exposure of service account credentials and source code access).
- **Integrity**: Medium (Potential modification of job configurations).
- **Availability**: Low (Localized impact to specific build jobs).
## Remediation
### Patches
Users should update the affected plugins via the Jenkins Update Center to the following versions or later:
- Active Directory Plugin: Update to version 2.4.2+
- AppSpider Plugin: Update to version 1.0.18+
- Bitbucket OAuth Plugin: Update to version 0.18+
- buildgraph-view Plugin: Update to version 1.9+
- Credentials Binding Plugin: Update to version 721+
- Email Extension Plugin: Update to version 1934+
- GitHub Integration Plugin: Update to version 0.7.4+
- Job Import Plugin: Update to version 144+
- LDAP Plugin: Update to version 808+
- Pipeline: Groovy Libraries Plugin: Update to version 798+
- Multijob Plugin: Update to version 663+
### Workarounds
- Disable the affected plugins if updates cannot be immediately applied.
- Restrict Jenkins UI access to trusted corporate networks/VPNs.
- Audit "Overall/Read" and "Job/Configure" permissions to ensure only authorized users can trigger the affected plugin logic.
## Detection
- **Indicators of Compromise**: Review Jenkins System Logs for unusual authentication failures from the LDAP/Active Directory plugins or unexpected configuration changes in the Audit Log.
- **Detection Methods**: Use the Jenkins plugin manager to scan for "Security Warnings" displayed in the administrative dashboard.
## References
- Jenkins Security Advisory: hxxps[://]www[.]jenkins[.]io/security/advisory/2026-05-27/
- Jenkins Security Portal: hxxps[://]www[.]jenkins[.]io/security/advisories/
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/jenkins-security-advisory-av26-515