ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2025-66482

Misskey is an open source, federated social media platform.

Published Dec 16, 2025 · catalog updated Oct 14, 2026 · Misskey is an open

Check if you run it

No confirmed exploitation is on record for CVE-2025-66482. EPSS is 0.34%. 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
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Advisory link
Affected products
cpe misskey/misskey

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 ( ) 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 to . 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 in config file.

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.

  • cpe misskey/misskey13.0.0

How to fix CVE-2025-66482

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-2025-66482. EPSS is 0.34%. Act only if a listed version of Misskey is an open is installed.

Which versions are affected?

Compare what you have installed with 13.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1188; CWE-307: Improper Restriction of Excessive Authentication Attempts. EPSS 0.34%. 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. Dec 16, 2025 · NIST NVD

    Detected

    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 ( ) has been added in config file to prevent this from happening. However, it is initialized with an insecure default value before version 2025.12

  2. Oct 14, 2026 · NIST NVD

    Updated

    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 ( ) has been added in config file to prevent this from happening. However, it is initialized with an insecure default value before version 2025.12

Sources

  • CVE.orgVulnerability recordCVE-2025-66482

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66482

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2025-66482

    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 ( ) has been ad

    nvd.nist.gov

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.