- Description
- Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7 Mattermost failed to validate Dynamic Client Registration redirect URIs by URL component (matching glob patterns against the raw URI string instead) which allows a remote unauthenticated attacker to register an OAuth client with an attacker-controlled callback host that bypasses the configured redirect URI allowlist via a crafted redirect URI that places an allowlisted host/path suffix inside the query string.. Mattermost Advisory ID: MMSA-2026-00700
- Source
- responsibledisclosure@mattermost.com
- NVD status
- Analyzed
- Products
- mattermost_server
CVSS 3.1
- Type
- Primary
- Base score
- 9.3
- Impact score
- 5.8
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
- Severity
- CRITICAL
- responsibledisclosure@mattermost.com
- CWE-601
- Hype score
- Not currently trending
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