Mattermost Server (11.10.x < 11.10.3) - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/mattermost-server-11.10.x--11.10.3/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioWed, 21 Oct 2026 16:07:25 +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/2026-10-mattermost-vulnerabilities/Wed, 21 Oct 2026 16:07:25 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-10-mattermost-vulnerabilities/Multiple unspecified vulnerabilities have been identified in Mattermost Server, requiring immediate review of vendor security bulletins and application of necessary patches.The French National Cybersecurity Agency (ANSSI) has published an advisory regarding multiple unspecified vulnerabilities in Mattermost Server. These vulnerabilities, identified in Mattermost security bulletins MMSA-2026-00772 and MMSA-2026-00783, could allow an attacker to trigger unspecified security issues. Details regarding specific vulnerability types or exploitation vectors remain undisclosed by the vendor.

Recommendation

  • Inventory all internal Mattermost Server instances to identify versions 11.10.x, 11.11.x, and 11.7.x.
  • Upgrade Mattermost Server instances to the following patched versions immediately:
  • Upgrade version 11.10.x to 11.10.3 or later.
  • Upgrade version 11.11.x to 11.11.2 or later.
  • Upgrade version 11.7.x to 11.7.13 or later.
  • Monitor the official Mattermost Security Updates portal for further technical disclosures.
]]>mediumadvisoryvulnerabilitysecurity-update