CVE-2026-9812

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate that a property field belongs to the specified run before updating its value which allows an authenticated user with run property-management access to crash the Playbooks plugin via a REST request referencing a property field that belongs to a different run. Mattermost Advisory ID: MMSA-2026-00684

Scoring

Severity

MEDIUM

CVSS base score

6.5

CVSS vector

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

EPSS probability

0.21%

CWE

CWE-639

Published

2026-09-14

Last modified

2026-09-14

Affected products

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

Weakness type

• CWE-639

Related vulnerabilities

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• CVE-2026-53552 — Goploy: Cross-namespace IDOR and RCE via body-supplied row id in project and project_file handlers
• CVE-2026-82874 — ToolJet before v3.16.208 Cross-Tenant Authorization Bypass via tooljet-db
• CVE-2026-88877 — Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
• CVE-2026-47156 — MantisBT: SOAP API Authentication Bypass with Privilege Escalation to Administrator
• CVE-2026-84148 — Insecure Direct Object Reference Vulnerability in Manacle Technologies ERP System
• CVE-2026-82441 — Apache Storm Nimbus: Cross-Tenant Blob Deletion and Cluster Denial of Service via Unvalidated Topology Dependency Keys
• CVE-2026-82281 — Kotaemon Missing Ownership Check in Conversation Functions

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