CVE-2023-25154: Misskey

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Misskey is an open source, decentralized social media platform. In versions prior to 13.5.0 the link to the instance to the sender that appears when viewing a user or note received through ActivityPub is not properly validated, so by inserting a URL with a javascript scheme an attacker may execute JavaScript code in the context of the recipient. This issue has been fixed in version 13.5.0. Users are advised to upgrade. Users unable to upgrade should not "view on remote" for untrusted instances.

Affected products

• Misskey Misskey: before 13.5.0 (fixed in 13.5.0)

Published 2023-02-22. Last modified 2026-06-17.