CVE-2026-18799

The record

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

Affected packages

Related vulnerabilities

• CVE-2026-55147 LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application… CWE-862
• CVE-2026-55146 LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application… CWE-862
• CVE-2026-62967 ZTNET is a ZeroTier web UI for private controllers with multiuser and organization… CWE-862
• CVE-2026-62989 Shopper is a Headless e-commerce Admin Panel. CWE-862
• CVE-2026-78403 Stack-based buffer overflow and missing authorization vulnerability in Thales Sentinel… CWE-862
• CVE-2026-62301 MyTube is a self-hosted downloader and player for several video websites. CWE-862
• CVE-2026-119337 RAGFlow is an open-source RAG (Retrieval-Augmented Generation) engine. CWE-862
• CVE-2026-116245 libpq looks a connection service up in the service file of the operating-system account… CWE-862