CVE-2023-49079: Misskey's missing signature validation allows arbitrary users to impersonate any remote user.

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-29 · updated 2026-06-17
Weakness: CWE-347

Description

Misskey is an open source, decentralized social media platform. Misskey's missing signature validation allows arbitrary users to impersonate any remote user. This issue has been patched in version 2023.11.1-beta.1.

Affected products

misskey-dev misskey: before 2023.11.1 — fixed in 2023.11.1

How to fix

Upgrade to a fixed version: misskey-dev misskey 2023.11.1. Check the vendor advisory for mitigations.

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-3f39-6537-3cgc
https://github.com/misskey-dev/misskey/security/advisories/GHSA-3f39-6537-3cgc

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