---
title: "CVE-2026-96656: Plex Media Server External Control of File Name or Path Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-96656/
description: "CVE-2026-96656 (Plex Media Server): Exploited in the wild (CISA KEV). Plex Media Server before 1.43.3.10861 allows an admin user to write arbitrary files…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-23
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-96656"
kev: true
cvss: 8.6
epss: 0.00758
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-96656: Plex Media Server External Control of File Name or Path Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Plex Media Server. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-10-20, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-10-23 ; treat that as the outer limit, not the target.
- EPSS 0.8% , percentile 55: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 55% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.
- Editorial verdict: Act now. Plex2Shell: Exploited RCE Chain in Plex Media Server — A public proof of concept chains four Plex bugs into code execution without credentials, and attackers have used it since October 17: update any internet-reachable server now, then check it for a miner or proxy.

## What it is

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.

## Affected products (CVE record)

- Plex Media Server: < 1.43.3.10861

## Severity

- cisa-cg CVSS 4.0: 8.6 `CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- cisa-cg CVSS 3.1: 7.2 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-10-20; federal due date 2026-10-23. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.76% probability of exploitation activity in the next 30 days; percentile 55.

## Sources

- [url](https://forums.plex.tv/t/plex-media-server/30447/711)
- [Listed in CISA KEV notes (forums.plex.tv)](https://forums.plex.tv/t/important-security-update-for-plex-media-server-v1-43-2-and-earlier/942319)
- [CVE.org record CVE-2026-96656](https://www.cve.org/CVERecord?id=CVE-2026-96656)
- [NVD entry CVE-2026-96656](https://nvd.nist.gov/vuln/detail/CVE-2026-96656)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96656)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [url](https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json)
- [url](https://zmain.info/blog/plex2shell)
- [boredhackerblog.info](https://www.boredhackerblog.info/2026/10/plex-vulnerabilities-being-exploited-in.html)

---
Source page: https://erroneo.us/security/cve/CVE-2026-96656/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt