CVE Watch8 sept 2026

CVE-2026-73309

XenForo before 2.3.13 contains an authentication bypass vulnerability in the OAuth2 token endpoint that allows unauthenticated attackers to

CVSS

7.4

Alto

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 8 sept 2026 · Última mod.: 8 sept 2026 · CWE-697

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

XenForo before 2.3.13 contains an authentication bypass vulnerability in the OAuth2 token endpoint that allows unauthenticated attackers to obtain valid token pairs by submitting empty values for client_secret and code_verifier parameters. Attackers can exploit PHP truthy evaluation logic, which treats empty strings as false and skips client secret validation and PKCE code verifier validation, to exchange a valid authorization code for a token pair without proving client identity or holding the PKCE commitment.

Referencias oficiales

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