CVE-2026-96654
Plex Media Server Improper Neutralization of Encoded URI Schemes in a Web Page Vulnerability
Plex Media Server contains an improper neutralization of encoded URI schemes in a web page vulnerability that could allow an attacker to call other plugins' functions and supply their own parameters. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96655, and CVE-2026-96656.
CISA due Oct 23, 2026
- Plex Media Server
- Moderate
- CVSS 6.9
- EPSS 0.47%
- Fixed version listed
What to do
Fixed version listed
- 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.
- CISA deadline for US federal agencies
- Oct 23, 2026
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Plex Media Server | before 1.43.3.10861 | 1.43.3.10861 |
Scores and signals
- Exploitation
- Exploited in the wild
- Severity
- Moderate, CVSS 6.9 (v4.0, scored by cisa-cg)
- EPSS
- 0.47% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 23, 2026)
- CISA's SSVC decision points
- Exploitation: active. Automatable: yes. Technical impact: partial. As of Oct 20, 2026.
- Weakness
- CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page
- Vendor
- Plex, Media Server
Timeline
- Added to CISA's Known Exploited Vulnerabilities catalog: exploited in the wild. US federal agencies must remediate by 2026-10-23.