CVE-2026-76839

Grav before 2.0.16 allows sandboxed Twig templates to access sensitive User fields through allow-listed offsetGet() and offsetexists() methods that lack field filtering. Attackers with page-edit permissions can call offsetGet() on User objects to extract hashed passwords and 2FA secrets, enabling offline password cracking and authentication bypass.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/getgrav/grav/security/advisories/GHSA-3jhr-mxmx-38cx
https://www.vulncheck.com/advisories/grav-before-information-disclosure-via-offsetget
https://github.com/getgrav/grav/security/advisories/GHSA-3jhr-mxmx-38cx

Configurations

No configuration.

History

12 Oct 2026, 15:10

Type	Values Removed	Values Added
Summary		(es) Grav anterior a la versión 2.0.16 permite que las plantillas Twig en entorno aislado accedan a campos de usuario sensibles a través de métodos offsetGet() y offsetexists() incluidos en la lista de permitidos que carecen de filtrado de campos. Atacantes con permisos de edición de página pueden llamar a offsetGet() en objetos de usuario para extraer contraseñas con hash y secretos 2FA, lo que permite el cracking de contraseñas sin conexión y la omisión de autenticación.

Information

Published : 2026-08-25 02:16

Updated : 2026-10-12 15:10

NVD link : CVE-2026-76839

Mitre link : CVE-2026-76839

CVE.ORG link : CVE-2026-76839

JSON object : View

Products Affected

No product.

CWE

CWE-522

Insufficiently Protected Credentials

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