Full Report
Jenkins security advisory (AV26-255)
Analysis Summary
# Vulnerability: Jenkins Core and LoadNinja Plugin Multiple Vulnerabilities
## CVE Details
*Note: Specific CVE IDs and CVSS scores were not explicitly detailed in the summary notice (AV26-255). Users should consult the primary advisory link for the full list of identifiers.*
- **CVE ID:** [Pending/Multiple]
- **CVSS Score:** [Variable] (Likely Critical/High based on historical Jenkins advisories)
- **CWE:** [Weakness type varies by specific CVE]
## Affected Systems
- **Products:**
- Jenkins (Weekly release)
- Jenkins (LTS - Long Term Support release)
- LoadNinja Plugin
- **Versions:**
- Jenkins Weekly: Version 2.554 and prior
- Jenkins LTS: Versions 2.541.2 and prior
- LoadNinja Plugin: Versions 2.1 and prior
- **Configurations:** standard Jenkins installations using affected core versions or the LoadNinja plugin.
## Vulnerability Description
While the specific technical flaws are outlined in the individual CVEs linked in the primary advisory, Jenkins advisories typically address issues such as:
- Cross-Site Request Forgery (CSRF) protections.
- Permission checks/Unauthorized access to system logs or configurations.
- Improper neutralization of input in web interfaces (XSS).
- Vulnerabilities in plugin dependency handling.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (refer to official Jenkins security tracker for real-time updates).
- **Complexity:** Medium (Standard for Jenkins plugin/core vulnerabilities).
- **Attack Vector:** Network (Most Jenkins vulnerabilities are exploitable via the web UI or API).
## Impact
- **Confidentiality:** Potential for unauthorized data access.
- **Integrity:** Potential for configuration changes or script execution.
- **Availability:** Dependent on the specific vulnerability (Potential for Service Denial).
## Remediation
### Patches
The following versions contain fixes for the reported vulnerabilities:
- **Jenkins Weekly:** Update to version 2.555 or later.
- **Jenkins LTS:** Update to version 2.541.3 or later.
- **LoadNinja Plugin:** Update to version 2.2 or later via the Jenkins Plugin Manager.
### Workarounds
- No specific workarounds are recommended other than upgrading the affected software.
- Restrict network access to the Jenkins controller to trusted users/IPs only.
- Implement "Logged-in users can do anything" or "Project-based Matrix Authorization" to limit exposure.
## Detection
- Monitor Jenkins system logs for unusual authentication patterns or unauthorized plugin configuration changes.
- Use the **Jenkins Administrative Monitor** (built-in) which will alert administrators if the instance is running a version with known vulnerabilities.
- Audit plugin usage to identify if the LoadNinja plugin is active.
## References
- Jenkins Security Advisory 2026-03-18: hxxps[://]www[.]jenkins[.]io/security/advisory/2026-03-18/
- Jenkins Security Advisories Index: hxxps[://]www[.]jenkins[.]io/security/advisories/
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/jenkins-security-advisory-av26-255