CVE-2026-96656Plex Media Server arbitrary file write
Updated under an hour ago ()
Does this affect you?
It affects Plex Media Server. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Oct 20, 2026; federal agencies had to remediate by Oct 23, 2026. Treat that date as your deadline.
Do this next
Free account, 1 product
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.
- CVSS
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-73
- Known exploited
- Added to CISA KEV Oct 20, 2026; federal remediation due Oct 23, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 1.79% (percentile 78)
- Assigned by
- cisa-cg
- NVD analysis
- Analyzed
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.