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Known exploited vulnerability

CVE-2026-96655

mediumCVSS 4.0 5.3In CISA KEVEPSS 11%Published · Plex

The short answer

CVE-2026-96655 affects Plex Media Server and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-10-20: attackers are using it, so patch it first.

What it is

Plex Media Server before 1.43.3.10861 allows an authenticated user to request arbitrary internal or external addresses via the '/video/:/transcode/universal' path parameter.

Weakness: CWE-918.

Severity

5.3 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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

Exploited (CISA KEV)

Yes, since Oct 20, 2026

Federal due date Nov 3, 2026

EPSS, next 30 days

11%

Higher than 96% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
Low
User interaction
None
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

What CISA says to do

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…

Affected products

Media Server. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-96655 being exploited?

Yes. CISA added CVE-2026-96655 to its Known Exploited Vulnerabilities catalog on 2026-10-20, with a federal remediation due date of 2026-11-03.

How do I fix CVE-2026-96655?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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