CVE-2025-54888

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. In versions below 1.3.20, 1.4.0-dev.585 through 1.4.12, 1.5.0-dev.636 through 1.5.4, 1.6.0-dev.754 through 1.6.7, 1.7.0-pr.251.885 through 1.7.8 and 1.8.0-dev.909 through 1.8.4, an authentication bypass vulnerability allows any unauthenticated attacker to impersonate any ActivityPub actor by sending forged activities signed with their own keys. Activities are processed before verifying the signing key belongs to the claimed actor, enabling complete actor impersonation across all Fedify instances. This is fixed in versions 1.3.20, 1.4.13, 1.5.5, 1.6.8, 1.7.9 and 1.8.5.

CVSS

No CVSS.

References

Link	Resource
https://github.com/fedify-dev/fedify/commit/226d9b84dbec52172a70138bba8861454afde42b
https://github.com/fedify-dev/fedify/security/advisories/GHSA-6jcc-xgcr-q3h4

Configurations

No configuration.

History

11 Aug 2025, 18:32

Type	Values Removed	Values Added
Summary		(es) Fedify es una librería de TypeScript para crear aplicaciones de servidores federados con tecnología ActivityPub. En las versiones anteriores a la 1.3.20, 1.4.0-dev.585 a 1.4.12, 1.5.0-dev.636 a 1.5.4, 1.6.0-dev.754 a 1.6.7, 1.7.0-pr.251.885 a 1.7.8 y 1.8.0-dev.909 a 1.8.4, una vulnerabilidad de omisión de autenticación permite a cualquier atacante no autenticado suplantar la identidad de cualquier actor de ActivityPub mediante el envío de actividades falsificadas firmadas con sus propias claves. Las actividades se procesan antes de verificar que la clave de firma pertenezca al actor declarado, lo que permite la suplantación completa del actor en todas las instancias de Fedify. Esto se solucionó en las versiones 1.3.20, 1.4.13, 1.5.5, 1.6.8, 1.7.9 y 1.8.5.

09 Aug 2025, 02:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-08-09 02:15

Updated : 2025-08-11 18:32

NVD link : CVE-2025-54888

Mitre link : CVE-2025-54888

CVE.ORG link : CVE-2025-54888

JSON object : View

Products Affected

No product.

CWE

CWE-287

Improper Authentication

CWE-863

Incorrect Authorization

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