CVE-2021-39169: Misskey

Medium severity, CVSS 5.4. EPSS: 0.7% chance of exploitation in the next 30 days.

Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.

Affected products

• Misskey Misskey: before 12.51.0 (fixed in 12.51.0)

Published 2021-08-27. Last modified 2026-06-17.