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Vulnerabilities

Vulnerability · CVE-2025-46340

Misskey is an open source, federated social media platform.

Published May 5, 2025 · catalog updated May 5, 2025 · Misskey is an open

Check if you run it

No confirmed exploitation is on record for CVE-2025-46340. EPSS is 0.25%. Act only if a listed version of Misskey is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Misskey is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Version ranges on file
Affected products
vendor misskey-dev misskey 12.0.0, < 2025.4.1

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 and , it is possible for an attacker to inject arbitrary CSS into the component. 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 or . This both can de-anonymize users and_allow further attacks in the client. Additionally, doesn't escape CSS when applying a property, allowing an attacker to craft a URL that applies arbitrary styles to the p

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor misskey-dev misskey 12.0.0, < 2025.4.112.0.0, < 2025.4.1

How to fix CVE-2025-46340

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-46340. EPSS is 0.25%. Act only if a listed version of Misskey is an open is installed.

Which versions are affected?

Compare what you have installed with misskey-dev misskey 12.0.0, < 2025.4.1 12.0.0, < 2025.4.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 5, 2025 · EUVD

    Detected

    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 and , it is possible for an attacker to inject arbitrary CSS into the component. 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 or . This bo

  2. May 5, 2025 · EUVD

    Updated

    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 and , it is possible for an attacker to inject arbitrary CSS into the component. 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 or . This bo

Sources

  • CVE.orgVulnerability recordCVE-2025-46340

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-46340

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-13505

    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 and , it is possible for an attacker to inject arbitrary CSS into the component. falls back to returning the or

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.