CVE-2025-27155
📋 TL;DR
Pinecone Simulator (pineconesim) up to commit ea4c337 is vulnerable to stored cross-site scripting (XSS) where attackers can inject malicious scripts that execute in users' browsers. This affects anyone running the vulnerable Pinecone Simulator, particularly developers testing P2P Matrix demos. The stored payloads are not permanent and are wiped on simulator restart.
💻 Affected Systems
- Pinecone Simulator (pineconesim)
⚠️ 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
Attackers could steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users within the simulator interface.
Likely Case
Limited impact due to the experimental nature of Pinecone and temporary payload storage, potentially affecting developers testing the simulator locally.
If Mitigated
Minimal impact if the simulator is not exposed to untrusted users or if proper input validation is implemented.
🎯 Exploit Status
Exploitation requires the attacker to inject malicious scripts into the simulator's storage, which executes when users view affected pages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit 218b280199b5b174085cb1c8fafe2d3aa661f85bd and later
Vendor Advisory: https://github.com/matrix-org/pinecone/security/advisories/GHSA-fr62-mg2q-7wqv
Restart Required: Yes
Instructions:
1. Update Pinecone to commit 218b280199b5b174085cb1c8fafe2d3aa661f85bd or later. 2. Restart pineconesim to clear any existing payloads. 3. Verify the fix by checking that input sanitization prevents script execution.
🔧 Temporary Workarounds
Restart Simulator Regularly
allRestart pineconesim to wipe stored XSS payloads since they are not permanent.
killall pineconesim
./pineconesim
Disable Simulator Web Interface
allRun pineconesim without the vulnerable web interface if not needed.
Check pineconesim documentation for CLI-only options
🧯 If You Can't Patch
- Isolate the simulator from untrusted networks and users.
- Implement network-level filtering to block malicious script patterns in simulator traffic.
🔍 How to Verify
Check if Vulnerable:
Check if pineconesim version is earlier than commit 218b280199b5b174085cb1c8fafe2d3aa661f85bd by reviewing source code or build metadata.Check Version:
git log --oneline -1 (if source) or check build/version info in pineconesim outputVerify Fix Applied:
Test XSS payload injection in the simulator interface; it should be sanitized and not execute after applying the patch.📡 Detection & Monitoring
Log Indicators:
- Unusual script tags or JavaScript in simulator request/response logs
- Errors related to script execution in pineconesim logs
Network Indicators:
- HTTP requests containing suspicious script patterns to the simulator port
SIEM Query:
source="pineconesim" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")