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

No history.

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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