Plex Media Server arbitrary file write

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-96656
StatePUBLISHED
Assignercisa-cg
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 17:17:23 UTC
Updated2026-09-23 17:58:26 UTC
DescriptionPlex 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.

Risk And Classification

Primary CVSS: v4.0 8.6 HIGH from 9119a7d8-5eab-497f-8521-727c672e3725

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-73 | CWE-73 CWE-73 External Control of File Name or Path

VersionSourceTypeScoreSeverityVector
4.09119a7d8-5eab-497f-8521-727c672e3725Secondary8.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED8.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.19119a7d8-5eab-497f-8521-727c672e3725Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Plex Media Server affected 1.43.3.10861 custom Not specified
CNA Plex Media Server unaffected 1.43.3.10861 Not specified

References

ReferenceSourceLinkTags
www.cve.org/CVERecord 9119a7d8-5eab-497f-8521-727c672e3725 www.cve.org
zmain.info/blog/plex2shell 9119a7d8-5eab-497f-8521-727c672e3725 zmain.info
forums.plex.tv/t/plex-media-server/30447/711 9119a7d8-5eab-497f-8521-727c672e3725 forums.plex.tv
raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json 9119a7d8-5eab-497f-8521-727c672e3725 raw.githubusercontent.com
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zach Main (en)

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