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TI-2026-63828 Aliases CVE-2026-96655GHSA-9x88-w2p7-56vh

Server-side request forgery in Plex Media Server

Priority HIGH 81Exploited in the wildCWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

Plex Media Server before 1.43.3.10861 contains a server-side request forgery flaw (CWE-918) in the '/video/:/transcode/universal' path parameter. An authenticated user can make the server request arbitrary internal or external addresses. CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2026-10-20.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-10-20CISA due date 2026-11-03
EPSS 0.10724 95th percentileScored 2026-11-07
Fix Fixed Media Server (Plex): 1.43.3.10861

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PlexMedia Serverbefore 1.43.3.108611.43.3.10861Patch availableCNA
  • Media Server VendorPlex Affected before 1.43.3.10861 Fixed in 1.43.3.10861 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:*before 1.43.3.10861VulnerablePlex
  • cpe:2.3:a:plex:media_server:*:*:*:*:*:*:*:* Versions before 1.43.3.10861 Vulnerable ·Plex

Remediation

Update Plex Media Server to version 1.43.3.10861, which contains the fix. CISA requires U.S. federal agencies to fix this vulnerability by 2026-11-03.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA Media Server (Plex) Fixed in 1.43.3.10861

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Plex Media Server 1.43.3.10861

    5 records Highest priority Priority CRITICAL 2 CRITICAL, 2 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-63829 Arbitrary file write in Plex Media Server enables code executionPriority CRITICAL 96
    • TI-2026-63827 Plex Media Server URL injection lets attackers call other pluginsPriority CRITICAL 88
    • TI-2026-63826 Server-side request forgery in Plex Media ServerPriority HIGH 81
    Show all 5 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-96655
  2. 2026-10-03 Alias added: GHSA-9x88-w2p7-56vh
  3. 2026-10-20 Added to CISA KEV
  4. 2026-10-21 CISA SSVC decision points changed
  5. 2026-10-21 Priority changed: LOW → HIGH
  6. 2026-10-25 EPSS moved to the 50th–90th percentile
  7. 2026-11-05 EPSS moved to the 95th–99th percentile

References

Advisory 3

Other 1

  • TI-2026-63829 Arbitrary file write in Plex Media Server enables code execution KEVCVSS 4.0HIGH 8.6
  • TI-2020-04669 Deserialization of untrusted data in Plex Media Server KEVCVSS 3.1HIGH 7.2
  • TI-2026-63827 Plex Media Server URL injection lets attackers call other plugins KEVCVSS 4.0MEDIUM 6.9
  • TI-2026-63826 Server-side request forgery in Plex Media Server KEVCVSS 4.0MEDIUM 5.3
  • TI-2025-42857 Incorrect authorization in Plex Media Server CVSS 3.1HIGH 8.5
  • TI-2021-13235 Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service. CVSS 3.1HIGH 7.5
See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences