CVE-2025-54888

HIGHNVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated
8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100

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 (value × EchelonGraph’s weight)
Severity87% × 45%
The EG Score, 8.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 9, 2025

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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 rangeFix by version rangeDependents
@fedify/fedify—
  • every version up to 1.3.20: fixed in 1.3.20
  • 1.4.0-dev.585 up to 1.4.13: fixed in 1.4.13
  • 1.5.0-dev.636 up to 1.5.5: fixed in 1.5.5
  • 1.6.0-dev.754 up to 1.6.8: fixed in 1.6.8
  • 1.7.0-pr.251.885 up to 1.7.9: fixed in 1.7.9
  • 1.8.0-dev.909 up to 1.8.5: fixed in 1.8.5
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 29× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 91 of 195 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 9 repeat rows among the latest 100 are merged into the row they repeat. The 104 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 20:30 UTCEG score recompute
  2. 2026-10-11 18:42 UTCEG score recompute
  3. 2026-10-11 15:17 UTCEG score recompute
  4. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-10 19:03 UTCOSV refresh
  7. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-08 17:10 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-09-26 00:25 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-09-21 21:06 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-09-21 06:19 UTCOSV refresh
  23. 2026-09-19 15:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-09-17 19:29 UTCEPSS rescoreEPSS 0.6% · 47th percentile
Show 66 more
  1. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  4. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  5. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  6. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  7. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-09-05 15:28 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-02 04:09 UTCOSV refresh
  15. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-09-01 04:38 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  21. 2026-08-26 14:45 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-08-24 14:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  24. 2026-08-24 09:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  26. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  27. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  28. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  29. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  30. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  31. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  32. 2026-08-16 06:29 UTCOSV refresh
  33. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  34. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  35. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  36. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  37. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  38. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  39. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  40. 2026-08-08 16:36 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  41. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  42. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  43. 2026-08-05 19:16 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  44. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  45. 2026-08-04 10:37 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  46. 2026-08-03 10:35 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  47. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  48. 2026-08-01 04:15 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  49. 2026-07-31 23:42 UTCOSV refresh
  50. 2026-07-30 16:27 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  51. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  52. 2026-07-28 15:35 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  53. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  54. 2026-07-25 14:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  55. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  56. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  57. 2026-07-23 02:58 UTCEG score recompute
  58. 2026-07-22 14:07 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  59. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  60. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  61. 2026-07-19 14:30 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  62. 2026-07-19 02:28 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  63. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  64. 2026-07-16 17:02 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  65. 2026-07-15 16:57 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  66. 2026-07-15 01:59 UTCEPSS rescoreEPSS 0.6% · 43rd percentile

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Frequently asked(5)

What is CVE-2025-54888?
CVE-2025-54888 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2025-54888 published?
The CVE record for CVE-2025-54888 was published on August 9, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 15, 2026; the record at its source may have been updated since.
Is CVE-2025-54888 actively exploited?
CVE-2025-54888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-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?
A fix for CVE-2025-54888 is available: update to the fixed version the vendor names in its advisory.

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