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CVE-2026-19867

4.3 medium SSVC exploitation: none Undergoing Analysis
NVD · CVE.org

Mattermost versions 11.10.x <= 11.10.0, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to cap the number and size of mention keys stored in a user's notification properties, and to bound the quadratic multibyte-keyword matching performed for each post, which allows an authenticated user to degrade post-processing latency and consume excessive CPU on behalf of other members of any channel they share via storing an oversized notify_props.mention_keys list on their own profile.. Mattermost Advisory ID: MMSA-2026-00773

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → Undergoing AnalysisNVD modified 2026-10-16 19:23
  2. First seenCVSS 4.3NVD modified 2026-10-16 07:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1