CVE-2025-66482

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% 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
Trending — 3 sources updated this weekElevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or not using a reverse proxy at all can bypass IP rate limiting by adding a forged X-Forwarded-For header. Starting with version 2025.9.1, an option (trustProxy) has been added in config file to prevent this from happening. However, it is initialized with an insecure default value before version 2025.12.0-alpha.2, making it still vulnerable if the configuration is not set correctly. This is patched in v2025.12.0-alpha.2 by flipping default value of trustProxy to false. Users of a trusted reverse proxy who are unsure if they manually overode this value should check their config for optimal behavior. Users are running Misskey with a trusted reverse proxy should not be affected by this vulnerability. From v2025.9.1 to v2025.11.1, workaround is available. Set trustProxy: false in config file.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
60(Attend)
EG Risk 60/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
21.8%
KEV
Not listed

Published

December 16, 2025

Last Modified

June 17, 2026

References (3)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
misskey-js—2025.12.0-alpha.2—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 48× 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.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 12:19 UTCOSV refresh
  4. 2026-07-23 03:01 UTCEG score recompute
  5. 2026-07-22 14:08 UTCEPSS rescore
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  25. 2026-07-06 16:27 UTCEPSS rescore
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  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 07:32 UTCOSV refresh
  3. 2026-07-06 02:23 UTCEPSS rescore
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  22. 2026-06-23 21:32 UTCEPSS rescore
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  24. 2026-06-22 14:25 UTCEPSS rescore
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  29. 2026-06-19 19:25 UTCEPSS rescore
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  31. 2026-06-18 17:52 UTCEPSS rescore
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  33. 2026-06-17 19:14 UTCOSV refresh
  34. 2026-06-16 17:52 UTCEPSS rescore
  35. 2026-06-15 17:48 UTCEPSS rescore
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  37. 2026-06-14 23:18 UTCEPSS rescore
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  42. 2026-06-10 22:18 UTCEPSS rescore
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  44. 2026-06-10 13:22 UTCEPSS rescore
  45. 2026-06-08 14:17 UTCEPSS rescore
  46. 2026-06-08 14:16 UTCEPSS rescore
  47. 2026-06-07 15:24 UTCEPSS rescore
  48. 2026-06-07 15:24 UTCEPSS rescore
  49. 2026-06-06 13:47 UTCEPSS rescore
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  51. 2026-06-05 22:46 UTCEPSS rescore
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  64. 2026-05-31 00:16 UTCEPSS rescore
  65. 2026-05-29 17:32 UTCEG score recompute
  66. 2026-05-29 13:44 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-66482?
CVE-2025-66482 is a medium vulnerability published on December 16, 2025. Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or not using a reverse proxy at all can bypass IP rate limiting by adding a forged X-Forwarded-For header. Starting with version 2025.9.1, an option (trustProxy) has been added in config file to…
When was CVE-2025-66482 disclosed?
CVE-2025-66482 was first published in the National Vulnerability Database on December 16, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66482 actively exploited?
CVE-2025-66482 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-66482?
CVE-2025-66482 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2025-66482?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66482, 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

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