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High · 7.2 Known exploited Scanner template Public exploit CVE-2026-96656 EUVD-2026-85370GHSA-2g2v-9wf5-6m3g

Plex Media Server arbitrary file write

Published Sep 23, 2026 · Updated Oct 21, 2026 · Assigned by cisa-cg

Vendor: Plex Product: Media Server

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.

Affected products

VendorProductAffectedFixed
Plex Media Server < 1.43.3.10861 1.43.3.10861

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • a3igner/plex-codec-cache-implant ★ 0 · Oct 18, 2026

    Incident write-up: unsigned .so in the Plex Media Server codec cache executes a dropper on every transcode (CVE-2026-96656) — IOCs, STIX, YARA

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

Advisories 1

References

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