Improper input validation in Misskey
CVE-2025-46340
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…
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.002 (11.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Misskey
- Misskey-dev Misskey — versions >= 12.0.0, < 2025.4.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-46340?
- CVE-2025-46340 is a high-severity vulnerability in Misskey, classified under Improper Input Validation. CVSS score: 7.2/10. Published 2025-05-05.
- How severe is CVE-2025-46340?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2025-46340 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.