CVE-2021-39169

MediumCVSS 5.4/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
misskey-dev	misskey	< 12.51.0

References

https://github.com/misskey-dev/misskey/commit/ec203f7f795766f76b55fecc9248168c1cdf6c99Patch, Third Party Advisory
https://github.com/misskey-dev/misskey/security/advisories/GHSA-pmmv-jwqh-f5wwPatch, Third Party Advisory
https://github.com/misskey-dev/misskey/commit/ec203f7f795766f76b55fecc9248168c1cdf6c99Patch, Third Party Advisory
https://github.com/misskey-dev/misskey/security/advisories/GHSA-pmmv-jwqh-f5wwPatch, Third Party Advisory

Timeline

Published: Aug 27, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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