Mattermost Server (11.11.x < 11.11.4) - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/mattermost-server-11.11.x--11.11.4/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioMon, 09 Nov 2026 16:12:21 +0000https://feed.craftedsignal.io/favicon-32x32.pngCraftedSignal Threat Feedhttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svgMattermost Server: Multiple Security Vulnerabilitieshttps://feed.craftedsignal.io/briefs/2026-11-mattermost-vulnerabilities-8e4be0e6/Mon, 09 Nov 2026 16:12:21 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-11-mattermost-vulnerabilities-8e4be0e6/Mattermost has released security updates addressing multiple unspecified vulnerabilities across several server versions, requiring immediate patching.The French National Cybersecurity Agency (ANSSI) has issued an advisory regarding multiple vulnerabilities in Mattermost Server. These issues were disclosed in Mattermost security bulletins MMSA-2026-00592, MMSA-2026-00781, and MMSA-2026-00786. The vendor has not provided specific details regarding the nature of the vulnerabilities or their potential impact.

Recommendation

  • Inventory all deployed Mattermost Server instances to identify affected versions.
  • Upgrade Mattermost Server instances to the latest secure versions as defined by the vendor security bulletins.
  • Monitor the official Mattermost security updates page for additional technical details as they become available.
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