CVE-2025-54888: high-severity vulnerability in fedify-dev fedify
@fedify/fedify: Improper Authentication and Incorrect Authorization
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.6%
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Affected products
fedify-dev · fedifyRelated CVEs — fedify-dev fedify
In the same product, most dangerous first.
CVE-2025-68475HIGHFedify has ReDoS Vulnerability in HTML Parsing RegexEPSS 0.6%CVE-2026-62857HIGHFedify: Server-Side Request Forgery in getNodeInfo() Allows Access to Internal Network ResourcesEPSS 0.4%CVE-2026-50131HIGHFedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 rangesEPSS 0.4%CVE-2026-42462HIGHFedify has an LD-Signature Bypass via JSON-LD Named-Graph RestructuringEPSS 0.2%