CyberSecBulletin
CVE-2026-96654Exploited in the wildNVD status: Analyzed

Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page

Published Updated By the CyberSecBulletin desk

CVE-2026-96654 is a medium-severity improper neutralization of encoded URI schemes in a web page vulnerability in Media Server from Plex, with a CVSS 3.1 base score of 6.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 1.43.3.10861 as the first without the flaw, so updating Media Server to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on October 20, 2026, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update Media Server to 1.43.3.10861 or a later version.
  2. CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
PlexMedia Serverbefore 1.43.3.108611.43.3.10861

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
LowSome restricted data can be read.
Integrity
LowLimited modification of data is possible.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. Scored by CNA.

Scoring systemScoreSeverityScored by
CVSS 4.06.9MediumCNA
CVSS 3.16.5MediumCNA

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Neutralization of Encoded URI Schemes in a Web Page

The web application improperly neutralizes user-controlled input for executable script disguised with URI encodings.

How developers prevent this class of flaw

  • Resolve all URIs to absolute or canonical representations before processing.
  • With Struts, write all data from form beans with the bean's filter attribute set to true.

More Improper Neutralization of Encoded URI Schemes in a Web Page vulnerabilities (CWE-84)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: partial).
  3. Added to CISA's Known Exploited Vulnerabilities catalogue.
  4. Record last changed materially (score, affected products, status or references).
  5. Deadline for US federal agencies to remediate, set by CISA.

References

Patches and release notes

Our coverage

Other vulnerabilities in Media Server

All Media Server vulnerabilities

Recent Improper Neutralization of Encoded URI Schemes in a Web Page vulnerabilities

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