CVE-2025-46340

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.2 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 88% 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
7.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.2Exploit: 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. Starting in version 12.0.0 and prior to version 2025.4.1, due to an oversight in the validation performed in UrlPreviewService and MkUrlPreview, it is possible for an attacker to inject arbitrary CSS into the MkUrlPreview component. UrlPreviewService.wrap falls back to returning the original URL if it's using a protocol that is likely to not be understood by Misskey, IE something other than http or https. This both can de-anonymize users and_allow further attacks in the client. Additionally, MkUrlPreview doesn't escape CSS when applying a background-image property, allowing an attacker to craft a URL that applies arbitrary styles to the preview element. Theoretically, an attacker can craft a CSS injection payload to create a fake error message that can deceive the user into giving away their credentials or similar sensitive information. Version 2025.4.1 contains a patch for the issue.

CVSS v3
7.2
EG Score
7.2(medium)
EG Risk
63(Attend)
EG Risk 63/100SSVC: 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
Severity72% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
11.8%
KEV
Not listed

Published

May 5, 2025

Last Modified

September 3, 2025

References (2)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 51× 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 02:56 UTCEG score recompute
  3. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-08 15:15 UTCEPSS rescore
  2. 2026-07-07 13:45 UTCEPSS rescore
  3. 2026-07-07 02:51 UTCOSV refresh
  4. 2026-07-06 16:27 UTCEPSS rescore
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  27. 2026-06-22 14:25 UTCEPSS rescore
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  35. 2026-06-18 17:52 UTCEPSS rescore
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  37. 2026-06-18 13:35 UTCOSV refresh
  38. 2026-06-17 17:52 UTCEPSS rescore
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  48. 2026-06-10 22:18 UTCEPSS rescore
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  68. 2026-05-31 00:16 UTCEPSS rescore
  69. 2026-05-31 00:16 UTCEPSS rescore
  70. 2026-05-30 06:07 UTCEG score recompute
  71. 2026-05-29 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-46340?
CVE-2025-46340 is a high vulnerability published on May 5, 2025. Misskey is an open source, federated social media platform. Starting in version 12.0.0 and prior to version 2025.4.1, due to an oversight in the validation performed in UrlPreviewService and MkUrlPreview, it is possible for an attacker to inject arbitrary CSS into the MkUrlPreview component.…
When was CVE-2025-46340 disclosed?
CVE-2025-46340 was first published in the National Vulnerability Database on May 5, 2025, with the most recent update on September 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-46340 actively exploited?
CVE-2025-46340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-46340?
CVE-2025-46340 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2025-46340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-46340, 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.

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