CVE-2025-54888

Aug. 9, 2025, 2:15 a.m.

8.7
High

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.

Product(s) Impacted

Vendor Product Versions
Fedify
  • Fedify
  • <1.3.20, 1.4.0-dev.585-1.4.12, 1.5.0-dev.636-1.5.4, 1.6.0-dev.754-1.6.7, 1.7.0-pr.251.885-1.7.8, 1.8.0-dev.909-1.8.4

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-287
Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a fedify fedify <1.3.20 / / / / / / /
a fedify fedify 1.4.0-dev.585-1.4.12 / / / / / / /
a fedify fedify 1.5.0-dev.636-1.5.4 / / / / / / /
a fedify fedify 1.6.0-dev.754-1.6.7 / / / / / / /
a fedify fedify 1.7.0-pr.251.885-1.7.8 / / / / / / /
a fedify fedify 1.8.0-dev.909-1.8.4 / / / / / / /

References

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

Tags

security-advisories@github.com
CWE-287
2025-08-09
CVE-2025-54888

CVSS Score

8.7 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: HIGH
  • Availability Impact: NONE
  • Exploit Maturity: NOT_DEFINED

    • 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

    View Vector String

Timeline

Published: Aug. 9, 2025, 2:15 a.m.
Last Modified: Aug. 9, 2025, 2:15 a.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

security-advisories@github.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.