🛡️ CVE-2025-54888
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-287 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE CWE-287
Public Exploit ✅ No
Source NVD
Published 2025-08-08
Updated 2026-06-02
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
@fedify/fedify
unknown

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