CVE-2025-32791
📋 TL;DR
This vulnerability in Backstage's permission plugin backend allows attackers to extract information from conditional decisions returned by permission policies. Only systems using Backstage's permission system with conditional decisions are affected. The impact is limited to information disclosure about permission logic.
💻 Affected Systems
- Backstage Scaffolder plugin
- Backstage permission plugin backend
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Sensitive information about permission policy logic and conditional decision structures could be exposed, potentially revealing security control details.
Likely Case
Limited information disclosure about permission decision structures without exposing actual sensitive data or credentials.
If Mitigated
No impact if permission system is not used or conditional decisions don't contain sensitive information.
🎯 Exploit Status
Requires understanding of Backstage permission system and API access
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.6.0 of the permissions backend
Vendor Advisory: https://github.com/backstage/backstage/security/advisories/GHSA-f8j4-p5cr-p777
Restart Required: Yes
Instructions:
1. Update Backstage permissions backend to version 0.6.0 or later. 2. Update package.json dependencies. 3. Run npm/yarn install. 4. Restart Backstage services.
🔧 Temporary Workarounds
Secure Conditional Decisions
allEnsure permission policies are crafted so conditional decisions don't contain sensitive information
🧯 If You Can't Patch
- Disable permission system if not required
- Review and sanitize all conditional decision logic in permission policies
🔍 How to Verify
Check if Vulnerable:
Check if using Backstage permission system with version <0.6.0 and conditional decisions in policiesCheck Version:
npm list @backstage/plugin-permission-backendVerify Fix Applied:
Verify permissions backend version is >=0.6.0 and test permission API responses📡 Detection & Monitoring
Log Indicators:
- Unusual permission API calls
- Multiple conditional decision queries
Network Indicators:
- Increased traffic to permission backend endpoints
SIEM Query:
source="backstage" AND (endpoint="/permission" OR endpoint="/api/permission") AND status=200