CVE-2025-54888

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 56% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.7
EG Score
8.7(medium)
EG Risk
70(Attend)
EG Risk 70/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

August 9, 2025

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Improper Authentication and Incorrect Authorization in @fedify/fedify · Advisory · fedify-dev/fedify · GitHub

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

commit 14a2f8c6d2c3 (fedify-dev/fedify)

Fix landed in fedify-dev/fedify commit 14a2f8c6d2c3 — awaiting tagged release

https://github.com/fedify-dev/fedify/commit/14a2f8c6d2c3cbc00c3170a86ad3b7b8555c6847

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@fedify/fedify—1.8.5—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 180 total refreshes for this CVE.

  1. 2026-09-19 15:42 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-17 19:29 UTCEPSS rescore
  5. 2026-09-16 14:07 UTCEPSS rescore
  6. 2026-09-16 05:14 UTCEPSS rescore
  7. 2026-09-13 16:46 UTCEPSS rescore
  8. 2026-09-12 15:00 UTCEPSS rescore
  9. 2026-09-11 14:52 UTCEPSS rescore
  10. 2026-09-11 09:36 UTCEPSS rescore
  11. 2026-09-10 09:34 UTCEPSS rescore
  12. 2026-09-08 21:59 UTCEPSS rescore
  13. 2026-09-07 16:00 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-05 15:28 UTCEPSS rescore
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:11 UTCEPSS rescore
  18. 2026-09-02 04:09 UTCOSV refresh
  19. 2026-09-01 13:53 UTCEPSS rescore
  20. 2026-09-01 04:38 UTCEPSS rescore
  21. 2026-08-30 19:16 UTCEPSS rescore
  22. 2026-08-30 01:21 UTCEPSS rescore
  23. 2026-08-28 21:40 UTCEPSS rescore
  24. 2026-08-27 14:24 UTCEPSS rescore
  25. 2026-08-26 14:45 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-24 14:16 UTCEPSS rescore
  3. 2026-08-24 09:22 UTCEPSS rescore
  4. 2026-08-23 00:18 UTCEPSS rescore
  5. 2026-08-21 23:48 UTCEPSS rescore
  6. 2026-08-20 22:54 UTCEPSS rescore
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:47 UTCEPSS rescore
  9. 2026-08-17 13:46 UTCEPSS rescore
  10. 2026-08-16 14:55 UTCEPSS rescore
  11. 2026-08-16 06:29 UTCOSV refresh
  12. 2026-08-16 02:13 UTCEPSS rescore
  13. 2026-08-15 01:29 UTCEPSS rescore
  14. 2026-08-13 21:59 UTCEPSS rescore
  15. 2026-08-12 13:50 UTCEPSS rescore
  16. 2026-08-12 13:50 UTCEPSS rescore
  17. 2026-08-11 13:42 UTCEPSS rescore
  18. 2026-08-10 23:59 UTCEPSS rescore
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-08 16:36 UTCEPSS rescore
  21. 2026-08-07 16:26 UTCEPSS rescore
  22. 2026-08-06 13:46 UTCEPSS rescore
  23. 2026-08-05 19:16 UTCEPSS rescore
  24. 2026-08-04 15:09 UTCEPSS rescore
  25. 2026-08-04 15:09 UTCEPSS rescore
  26. 2026-08-04 10:37 UTCEPSS rescore
  27. 2026-08-03 10:35 UTCEPSS rescore
  28. 2026-08-02 02:26 UTCEPSS rescore
  29. 2026-08-01 04:15 UTCEPSS rescore
  30. 2026-07-31 23:42 UTCOSV refresh
  31. 2026-07-30 16:27 UTCEPSS rescore
  32. 2026-07-30 01:30 UTCEPSS rescore
  33. 2026-07-28 15:35 UTCEPSS rescore
  34. 2026-07-26 14:54 UTCEPSS rescore
  35. 2026-07-25 14:17 UTCEPSS rescore
  36. 2026-07-24 14:17 UTCEPSS rescore
  37. 2026-07-23 14:18 UTCEPSS rescore
  38. 2026-07-23 02:58 UTCEG score recompute
  39. 2026-07-22 14:08 UTCEPSS rescore
  40. 2026-07-22 14:07 UTCEPSS rescore
  41. 2026-07-21 15:24 UTCEPSS rescore
  42. 2026-07-20 17:08 UTCEPSS rescore
  43. 2026-07-19 14:30 UTCEPSS rescore
  44. 2026-07-19 14:30 UTCEPSS rescore
  45. 2026-07-19 02:28 UTCEPSS rescore
  46. 2026-07-18 10:04 UTCEPSS rescore
  47. 2026-07-16 17:02 UTCEPSS rescore
  48. 2026-07-15 16:57 UTCEPSS rescore
  49. 2026-07-15 16:57 UTCEPSS rescore
  50. 2026-07-15 01:59 UTCEPSS rescore
  51. 2026-07-15 01:59 UTCEPSS rescore
  52. 2026-07-14 06:55 UTCOSV refresh
  53. 2026-07-13 22:29 UTCEPSS rescore
  54. 2026-07-13 06:12 UTCEPSS rescore
  55. 2026-07-13 06:12 UTCEPSS rescore
  56. 2026-07-12 05:46 UTCEPSS rescore
  57. 2026-07-11 08:27 UTCEPSS rescore
  58. 2026-07-11 08:27 UTCEPSS rescore
  59. 2026-07-09 19:09 UTCEPSS rescore
  60. 2026-07-08 15:15 UTCEPSS rescore
  61. 2026-07-07 13:45 UTCEPSS rescore
  62. 2026-07-06 16:27 UTCEPSS rescore
  63. 2026-07-06 16:27 UTCEPSS rescore
  64. 2026-07-06 02:23 UTCEPSS rescore
  65. 2026-07-06 02:23 UTCEPSS rescore
  66. 2026-07-05 02:30 UTCEPSS rescore
  67. 2026-07-04 06:30 UTCEPSS rescore
  68. 2026-07-02 17:01 UTCEPSS rescore
  69. 2026-07-01 15:06 UTCEPSS rescore
  70. 2026-06-30 23:22 UTCEPSS rescore
  71. 2026-06-28 14:07 UTCEPSS rescore
  72. 2026-06-28 14:07 UTCEPSS rescore
  73. 2026-06-28 04:55 UTCEPSS rescore
  74. 2026-06-27 03:08 UTCEPSS rescore
  75. 2026-06-27 03:08 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-54888?
CVE-2025-54888 is a high vulnerability published on August 9, 2025. 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…
When was CVE-2025-54888 disclosed?
CVE-2025-54888 was first published in the National Vulnerability Database on August 9, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-54888 actively exploited?
CVE-2025-54888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.1% of all scored CVEs.
What is the CVSS score of CVE-2025-54888?
CVE-2025-54888 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2025-54888?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-54888, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-54888

Explore →

Is Your Infrastructure Affected by CVE-2025-54888?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs