CVE-2025-50978
📋 TL;DR
Gitblit v1.7.1 has a reflected XSS vulnerability where attackers can inject malicious JavaScript via repository path names. When victims view manipulated URLs, arbitrary code executes in their browser context. This affects all Gitblit v1.7.1 installations with default configurations.
💻 Affected Systems
- Gitblit
📦 What is this software?
Gitblit by Gitblit
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack sessions, deface repositories, or deploy malware to users accessing the Gitblit interface.
Likely Case
Session hijacking, credential theft, or unauthorized repository modifications through social engineering attacks.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy headers in place.
🎯 Exploit Status
Proof of concept available in GitHub repository. Exploitation requires victim interaction with malicious URL.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.8.0 or later
Vendor Advisory: https://github.com/gitblit/gitblit/releases
Restart Required: Yes
Instructions:
1. Backup current Gitblit installation. 2. Download Gitblit v1.8.0 or later from official repository. 3. Replace existing installation with patched version. 4. Restart Gitblit service.
🔧 Temporary Workarounds
Implement WAF Rules
allDeploy web application firewall rules to block XSS payloads in URL parameters
Add Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to HTTP headers
🧯 If You Can't Patch
- Restrict Gitblit access to trusted internal networks only
- Implement mandatory URL parameter validation and sanitization at reverse proxy level
🔍 How to Verify
Check if Vulnerable:
Test by accessing Gitblit with crafted repository path containing XSS payload like '/repo/<script>alert(1)</script>'Check Version:
java -jar gitblit.jar --versionVerify Fix Applied:
After patching, test same XSS payloads should be properly sanitized and not execute📡 Detection & Monitoring
Log Indicators:
- Unusual repository path names containing script tags or JavaScript code
- Multiple failed access attempts with malformed URLs
Network Indicators:
- HTTP requests with script tags in URL parameters
- Unusual referrer headers pointing to external domains
SIEM Query:
source="gitblit.log" AND (url="*<script>*" OR url="*javascript:*")