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CVE Watch15 sept 2026

CVE-2026-12985

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

CVSS

6.8

Medio

EPSS

—

KEV

—

Exploit Today

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0-100

Publicado: 14 sept 2026 · Última mod.: 15 sept 2026 · CWE-601

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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

Referencias oficiales
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