CVE-2026-86348

Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701

Scoring

Severity

MEDIUM

CVSS base score

4.3

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS probability

0.22%

CWE

CWE-704

Published

2026-09-14

Last modified

2026-09-14

Affected products

• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost
• Mattermost Mattermost

Weakness type

• CWE-704

Related vulnerabilities

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• CVE-2023-21651 — Incorrect Type Conversion or Cast in Core
• CVE-2025-40541 — SolarWinds Serv-U Insecure Direct Object Reference (IDOR) Remote Code Execution Vulnerability
• CVE-2025-40540 — SolarWinds Serv-U Type Confusion Remote Code Execution Vulnerability
• CVE-2025-40539 — SolarWinds Serv-U Type Confusion Remote Code Execution Vulnerability
• CVE-2025-13720 — Bad cast in Loader in Google Chrome prior to 143.0.7499.41 allowed a remote attacker who had compromised the renderer pr

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