Mattermost Server (11.7.x < 11.7.12) - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/mattermost-server-11.7.x--11.7.12/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioThu, 29 Oct 2026 15:52:30 +0000https://feed.craftedsignal.io/favicon-32x32.pngCraftedSignal Threat Feedhttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svgMattermost Desktop App and Server multiple vulnerabilitieshttps://feed.craftedsignal.io/briefs/2026-10-mattermost-advisory/Thu, 29 Oct 2026 15:52:30 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-10-mattermost-advisory/Multiple undisclosed vulnerabilities in Mattermost Desktop App and Server products have been addressed in recent vendor security bulletins, requiring immediate patching.The French National Cybersecurity Agency (ANSSI) has issued an advisory regarding multiple vulnerabilities identified in Mattermost Desktop App and Server products. The specific nature of these vulnerabilities and their technical impact remain undisclosed by the vendor. Administrators should consult the referenced Mattermost security bulletins (MMSA-2026-00800, MMSA-2026-00767, MMSA-2026-00770, and MMSA-2026-00804) to obtain and deploy the necessary patches.

Recommendation

  • Perform an inventory of all Mattermost Desktop App and Server installations across the organization.
  • Patch Mattermost Desktop App to version 6.3.1 or higher (for the 6.3.x branch).
  • Patch Mattermost Desktop App to version 6.2.5 or higher (for the 6.x branch).
  • Patch Mattermost Server to versions 11.10.3, 11.11.2, or 11.7.12 as appropriate for the installed version.
  • Review the Mattermost official security updates page for further technical details as they become available.
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