CVE-2026-96656
highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.018 · 78 %ileexploit · PoCUSadded 2026-10-20remediate by 2026-10-23
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.
EPSS · scored 2026-10-27
Plex Media Server External Control of File Name or Path Vulnerability
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMedia Servercisa_csaf_it
Fixed in 1.43.3.10861.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (5)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- VA-26-266-01Plex Media Server2026-09-23csaf · cisa_csaf_itUS
Plex Media Server before 1.43.3.10861 contains multiple vulnerabilities. In the worst case, a remote attacker could steal a legitimate user's account credentials and eventually write arbitrary files or execute code.
sources
Which sources assert this record, and when.
references (6) nvd
External citations — patches, advisories, analysis.
- https://forums.plex.tv/t/plex-media-server/30447/711Release Notes
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.jsonThird Party Advisory
- https://www.boredhackerblog.info/2026/10/plex-vulnerabilities-being-exploited-in.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96656US Government Resource
- https://www.cve.org/CVERecord?id=CVE-2026-96656Third Party AdvisoryVDB Entry
- https://zmain.info/blog/plex2shellThird Party Advisory
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