CVE Watch24 ago 2026

CVE-2026-67204

BookStack before 26.05.4 contains a broken access control vulnerability that allows authenticated API users with image-update or image-delet

CVSS

5.4

Medio

EPSS

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KEV

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Exploit Today

0-100

Publicado: 24 ago 2026 · Última mod.: 24 ago 2026 · CWE-863

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

BookStack before 26.05.4 contains a broken access control vulnerability that allows authenticated API users with image-update or image-delete permissions to manipulate other users' avatars by exploiting missing content-type restrictions in the Image Gallery API endpoints. Attackers can supply a user avatar's ID to the API controller, which loads any image type without the web controller's gallery and drawio restrictions, and when the avatar's uploaded_to field matches a page ID accessible to the attacker, the authorization check passes allowing the attacker to rename, replace, or delete the target user's avatar without requiring user-management permission.

Referencias oficiales

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