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CVE-2026-18799

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

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to restrict Slack import account binding to system administrator-initiated imports which allows an authenticated attacker with team admin privileges to force-add existing Mattermost users to their team and forge posts attributed to those users' identities via a crafted Slack export containing target users' email addresses.. Mattermost Advisory ID: MMSA-2026-00757

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 08:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1