What is CVE-2023-49079?

CVE-2023-49079 is a critical-severity vulnerability in Misskey, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2023-11-29.

How severe is CVE-2023-49079?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Misskey

CVE-2023-49079

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.

Published 2023-11-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.6th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Misskey
Misskey-Dev Misskey — versions < 2023.11.1-beta.1

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

github.com/misskey-dev/misskey/security/advisories/GHSA-3f39-6537-3cgc (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2023-49079?: CVE-2023-49079 is a critical-severity vulnerability in Misskey, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2023-11-29.
How severe is CVE-2023-49079?: Critical severity. CVSS v3 base score is 9.3 out of 10.