Mattermost Server (11.7.x < 11.7.11, 11.8.x < 11.8.6, 11.9.x < 11.9.2) - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/mattermost-server-11.7.x--11.7.11-11.8.x--11.8.6-11.9.x--11.9.2/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioThu, 29 Oct 2026 18:36:35 +0000https://feed.craftedsignal.io/favicon-32x32.pngCraftedSignal Threat Feedhttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svgMattermost Server: Security policy bypass (CVE-2026-93851)https://feed.craftedsignal.io/briefs/2026-10-mattermost-bypass/Thu, 29 Oct 2026 18:36:35 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-10-mattermost-bypass/A security policy bypass vulnerability in Mattermost Server could allow an attacker to circumvent configured server security policies.A security policy bypass vulnerability has been identified in Mattermost Server. The vulnerability is tracked as CVE-2026-93851 and impacts specific versions of the 11.7.x, 11.8.x, and 11.9.x branches. The vulnerability allows an attacker to circumvent security policies configured on the server instance.

Impact

The vulnerability allows for the bypass of security policies enforced on the Mattermost Server, which may lead to unauthorized access or the circumvention of intended access controls.

Recommendation

  • Upgrade Mattermost Server installations to the patched versions as specified by the vendor in MMSA-2026-00742.
  • Patch affected versions:
  • 11.7.x to 11.7.11 or later
  • 11.8.x to 11.8.6 or later
  • 11.9.x to 11.9.2 or later
  • Monitor audit logs for anomalous administrative or access control modification events that do not correlate with known administrator activity.
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