# CERT-FR Flags Synology Plex and Chat Flaws

Published: 2026-11-09 · Severity: high · Sectors: Technology
Canonical: https://vorant.io/reports/0ee49551-0590-59ee-b966-272da39b2ebb/cert-fr-flags-synology-plex-and-chat-flaws
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> CERT-FR advisory details multiple vulnerabilities in Synology's Plex Media Server and Chat Client enabling remote code execution and data exposure.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1482

## What to check

- Applies to: The 5 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation: CISA lists CVE-2026-111497, CVE-2026-96652, CVE-2026-96654, CVE-2026-96655, and CVE-2026-96656 as exploited in the wild.

CERT-FR published an advisory covering multiple vulnerabilities in Synology products, specifically Plex Media Server for DSM (versions 7.2.1 through 7.4, prior to build 1.43.5.11079) and Synology Chat Client (versions prior to 1.2.5-0240). The flaws collectively allow an attacker to achieve remote code execution, cause a remote denial of service, bypass security policies, perform server-side request forgery (SSRF), and compromise data confidentiality.

Five CVEs are referenced (CVE-2026-111497, CVE-2026-96652, CVE-2026-96654, CVE-2026-96655, CVE-2026-96656) tied to two Synology security bulletins (SA_26_17 and SA_26_15) dated November 8-9, 2026. No in-the-wild exploitation is mentioned in this advisory; it is a standard vendor-coordinated disclosure. Defenders operating Synology DSM with Plex Media Server or Synology Chat Client should apply the vendor patches referenced in the bulletins promptly, as the combination of RCE and SSRF risks on internet-facing NAS devices is a common target for opportunistic scanning.

No specific threat actor, malware, or campaign is associated with this advisory; it is a routine vulnerability disclosure requiring patch management action.

## Mentioned in this report

- Vulnerabilities: CVE-2026-111497 (KEV), CVE-2026-96652 (KEV), CVE-2026-96654 (KEV), CVE-2026-96655 (KEV), CVE-2026-96656 (KEV)

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1482

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