CVE-2026-96656 (GCVE-0-2026-96656)

Vulnerability from cvelistv5 – Published: 2026-09-23 16:07 – Updated: 2026-10-21 03:56
VLAI CISA Previdian
Title
Plex Media Server arbitrary file write
Summary
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.
Severity
8.6 (High)
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
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · cisa-cg (v2.0.3)
Decision recorded 2026-09-14 18:24 UTC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 00:00 UTC
CWE
  • CWE-73 - External Control of File Name or Path
Assigner
cisa-cg CNA under the CISA root
CNA scorecard B 76/100 over 131 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Plex Media Server Affected: 0 , < 1.43.3.10861 (custom)
Unaffected: 1.43.3.10861
guessed Create a notification for this product.
Date Public
2026-08-03 00:00
Credits
Zach Main
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 303d78a4-26a7-45b6-8083-c95ad6aa1b49

Vulnerability ID: CVE-2026-96656

Status: Confirmed

Status Updated: 2026-10-20 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-20
Asserted: 2026-10-20
Scope
Notes: Plex Media Server External Control of File Name or Path Vulnerability | Affected: Plex / Media Server | Description: Plex Media Server contains an external control of file name or path vulnerability which can allow an admin user to write arbitrary files that may be executed on load. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96654, and CVE-2026-96655. | 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. | Due date: 2026-10-23 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://forums.plex.tv/t/important-security-update-for-plex-media-server-v1-43-2-and-earlier/942319 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-96656
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-73
Feed CISA Known Exploited Vulnerabilities Catalog
Product Media Server
Due Date 2026-10-23
Date Added 2026-10-20
Vendorproject Plex
Vulnerabilityname Plex Media Server External Control of File Name or Path Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-20 20:00 UTC | Updated: 2026-10-20 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b531d4e8-981c-4457-99a7-cd80b1e2b288

Vulnerability ID: CVE-2026-96656

Status: Confirmed

Status Updated: 2026-10-19 11:50 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-19
Asserted: 2026-10-19
Scope
Notes: Plex Media Server arbitrary file write | Affected: Plex / Media Server | CVSS: 8.6 (HIGH) | EPSS: 0.00396 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Plex Media Server arbitrary file write
Cve Id CVE-2026-96656
Vendor Plex
Ghsa Id GHSA-2G2V-9WF5-6M3G
Product Media Server
Added Date 2026-10-19T11:50:00.000Z
Cvss Score 8.6
Epss Score 0.00396
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.32308
Used In Malware unknown
Vulnerability Id CVE-2026-96656
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-10-20 12:00 UTC | Updated: 2026-10-20 12:00 UTC
Show details on NVD website
To clipboard 

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              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              }
            },
            {
              "other": {
                "content": {
                  "id": "CVE-2026-96656",
                  "options": [
                    {
                      "Exploitation": "none"
                    },
                    {
                      "Automatable": "no"
                    },
                    {
                      "Technical Impact": "total"
                    }
                  ],
                  "role": "CISA Coordinator",
                  "timestamp": "2026-09-14T18:24:56.053053Z",
                  "version": "2.0.3"
                },
                "type": "ssvc"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-73",
                  "description": "CWE-73 External Control of File Name or Path",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-23T16:07:10.048Z",
            "orgId": "9119a7d8-5eab-497f-8521-727c672e3725",
            "shortName": "cisa-cg"
          },
          "references": [
            {
              "name": "url",
              "tags": [
                "release-notes"
              ],
              "url": "https://forums.plex.tv/t/plex-media-server/30447/711"
            },
            {
              "name": "url",
              "tags": [
                "vdb-entry"
              ],
              "url": "https://www.cve.org/CVERecord?id=CVE-2026-96656"
            },
            {
              "name": "url",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json"
            },
            {
              "name": "url",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://zmain.info/blog/plex2shell"
            }
          ],
          "title": "Plex Media Server arbitrary file write"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
        "assignerShortName": "cisa-cg",
        "cveId": "CVE-2026-96656",
        "datePublished": "2026-09-23T16:07:10.048Z",
        "dateReserved": "2026-09-23T14:42:33.270Z",
        "dateUpdated": "2026-10-21T03:56:10.489Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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