CVE-2025-34158
📋 TL;DR
This vulnerability in Plex Media Server allows unauthorized access to server owner credentials and other accessible servers through API endpoints. It affects Plex Media Server versions 1.41.7.x through 1.42.0.x. Attackers can exploit this to gain access to Plex accounts and connected media servers.
💻 Affected Systems
- Plex Media Server
⚠️ 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
Complete compromise of Plex account, unauthorized access to all media content, potential credential theft leading to further account takeovers, and access to other servers linked to the account.
Likely Case
Unauthorized access to media content, exposure of server owner credentials, and access to other Plex servers accessible by the compromised account.
If Mitigated
Limited impact if servers are not internet-facing, strong network segmentation exists, and access controls prevent unauthorized API calls.
🎯 Exploit Status
Exploitation requires network access to the Plex server but does not require authentication to the vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.42.1
Vendor Advisory: https://forums.plex.tv/t/plex-media-server-security-update/928341
Restart Required: Yes
Instructions:
1. Open Plex Media Server. 2. Go to Settings > General. 3. Click 'Check for Updates' or download version 1.42.1 from plex.tv. 4. Install the update and restart the server.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to Plex Media Server to trusted IPs only
Firewall Block
allBlock external access to Plex server ports (default 32400)
🧯 If You Can't Patch
- Disable remote access and only allow local network connections
- Implement strict firewall rules to limit access to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check Plex Media Server version in Settings > General. If version is between 1.41.7.x and 1.42.0.x, it is vulnerable.Check Version:
On Linux: cat /usr/lib/plexmediaserver/version 2>/dev/null || echo 'Check Plex web interface'Verify Fix Applied:
Verify version is 1.42.1 or higher in Settings > General after update.📡 Detection & Monitoring
Log Indicators:
- Unusual access to /myplex/account or /api/resources endpoints
- Multiple failed authentication attempts followed by successful API calls
Network Indicators:
- Unusual traffic patterns to Plex server API endpoints from untrusted sources
SIEM Query:
source="plex.log" AND (uri="/myplex/account" OR uri="/api/resources") AND src_ip NOT IN trusted_networks🔗 References
- https://forums.plex.tv/t/plex-media-server-security-update/928341
- https://github.com/lufinkey/vulnerability-research/blob/main/CVE-2025-34158/README.md
- https://github.com/lufinkey/vulnerability-research/tree/main/CVE-2025-34158
- https://www.bleepingcomputer.com/news/security/plex-warns-users-to-patch-security-vulnerability-immediately/
- https://www.plex.tv/media-server-downloads/
- https://www.runzero.com/blog/plex/
- https://www.tenable.com/plugins/nessus/250294
- https://www.vulncheck.com/advisories/plex-media-server-unspecified
