Synology-SA-26:17 Plex Media Server (Plex2Shell)

Abstract

Synology has released a security update for the Plex Media Server package in DSM to address the Plex2Shell vulnerabilities.

Affected Products

Mitigation

None

Detail

• CVE-2026-96656

  • Severity: Important
  • CVSS3 Base Score: 7.2
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • CWE-73: External Control of File Name or Path
  • Plex Media Server before 1.43.3.10861 allows an admin user to write arbitrary files that may be executed on load. The preference TranscoderH264Options is appended verbatim to x264's option string on every transcode. At startup, all .so files are run without signature, execute bit, or symbol checks.

• CVE-2026-96654

  • Severity: Important
  • CVSS3 Base Score: 6.5
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  • CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page
  • Plex Media Server before 1.43.3.10861 does not correctly neutralize URL values included in 'searchOne,' allowing an attacker to call other plugins' functions and supply their own parameters.

• CVE-2026-96652

  • Severity: Important
  • CVSS3 Base Score: 4.3
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
  • CWE-918: Server-Side Request Forgery
  • 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.

• CVE-2026-96655

  • Severity: Important
  • CVSS3 Base Score: 4.3
  • CVSS3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
  • CWE-918: Server-Side Request Forgery
  • Plex Media Server before 1.43.3.10861 allows an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter.

Revision