CVE-2026-96652: CWE-918 Server-Side Request Forgery (SSRF) in Plex Media Server
Plex Media Server before 1.43.3.10861 allows SSRF via '/player/timeline'. An attacker using any X-Plex-Token value can include a full URL in the 'protocol' parameter and force the Plex server to POST to the attacker's chosen destination.
AI Analysis
Technical Summary
Plex Media Server versions prior to 1.43.3.10861 contain a server-side request forgery (SSRF) vulnerability identified as CWE-918. The flaw exists in the '/player/timeline' endpoint, where an attacker can supply any X-Plex-Token value and include a full URL in the 'protocol' parameter. This causes the Plex server to perform a POST request to the attacker's chosen destination, potentially allowing the attacker to interact with internal or external systems via the server.
Potential Impact
The vulnerability allows an attacker with any X-Plex-Token value to coerce the Plex Media Server into sending POST requests to arbitrary URLs. This could be used to interact with internal network resources or external systems, potentially leading to information disclosure or other indirect impacts. The CVSS score of 4.3 reflects a medium severity with low complexity and no user interaction required. There is no indication of confidentiality, integrity, or availability impact beyond limited information disclosure.
Mitigation Recommendations
A fix is available in Plex Media Server version 1.43.3.10861. Users should upgrade to this version or later to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the official patch. No additional mitigations are specified.
CVE-2026-96652: CWE-918 Server-Side Request Forgery (SSRF) in Plex Media Server
Description
Plex Media Server before 1.43.3.10861 allows SSRF via '/player/timeline'. An attacker using any X-Plex-Token value can include a full URL in the 'protocol' parameter and force the Plex server to POST to the attacker's chosen destination.
CVSS v3.1
Score 4.3medium
Affected software
Plex
Media Server
pkg:github/plexinc/plex-media-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Plex Media Server versions prior to 1.43.3.10861 contain a server-side request forgery (SSRF) vulnerability identified as CWE-918. The flaw exists in the '/player/timeline' endpoint, where an attacker can supply any X-Plex-Token value and include a full URL in the 'protocol' parameter. This causes the Plex server to perform a POST request to the attacker's chosen destination, potentially allowing the attacker to interact with internal or external systems via the server.
Potential Impact
The vulnerability allows an attacker with any X-Plex-Token value to coerce the Plex Media Server into sending POST requests to arbitrary URLs. This could be used to interact with internal network resources or external systems, potentially leading to information disclosure or other indirect impacts. The CVSS score of 4.3 reflects a medium severity with low complexity and no user interaction required. There is no indication of confidentiality, integrity, or availability impact beyond limited information disclosure.
Mitigation Recommendations
A fix is available in Plex Media Server version 1.43.3.10861. Users should upgrade to this version or later to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the official patch. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisa-cg
- Date Reserved
- 2026-09-23T14:42:11.354Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab3ff4ff7a7c541060b3040
Added to database: 09/23/2026, 16:33:19 UTC
Last enriched: 09/23/2026, 16:48:03 UTC
Last updated: 09/24/2026, 01:57:04 UTC
Views: 8
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