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CVE-2026-96656

7.2, high Known exploited

Plex Media Server External Control of File Name or Path Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.2, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 32.3% of scored CVEs
Exploitation
Confirmed in the wild
Published
23 Sept 202628 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 20 Oct 2026. US federal agencies must remediate by 23 Oct 2026.

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.

Description

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.

Details

Vendor
Plex
Product
Media Server
Weakness
CWE-73 (opens in a new tab)
Status
Modified
Updated
20 Oct 2026
Assigner
9119a7d8-5eab-497f-8521-727c672e3725

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References 6

Advisories 3

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Plex CVEs

Every Plex CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-96652 Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability KEV EPSS 0.2% 4.3, medium
  • CVE-2026-96654 Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page Vulnerability KEV EPSS 0.2% 6.5, medium
  • CVE-2026-96655 Plex Media Server Server-Side Request Forgery (SSRF) Vulnerability KEV EPSS 0.2% 4.3, medium
  • CVE-2020-5741 Plex Media Server Remote Code Execution Vulnerability KEV EPSS 73% 7.2, high

Beyond this page

Is CVE-2026-96656 in your network?

This page tells you how dangerous CVE-2026-96656 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-96656 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-96656 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 21 Oct 2026, not the live upstream state.