PT-2021-22426 · Misskey · Misskey

Acid-Chicken + 2 · Published 2021-08-27 · Updated 2021-09-08 · CVE-2021-39169

Positive Technologies (AI Summary)

CVSS v3.1

8.0

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Misskey versions prior to 12.51.0

Description Misskey is a decentralized microblogging platform. In versions 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.

Recommendations For versions prior to 12.51.0, upgrade to version 12.51.0 to resolve the issue. As a temporary workaround, consider restricting access to the web client built-in dialog until the upgrade is applied.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-39169

GHSA-PMMV-JWQH-F5WW

Affected Products

Misskey

References · 5

• https://github.com/misskey-dev/misskey/security/advisories/GHSA-pmmv-jwqh-f5ww · Patch
• https://github.com/misskey-dev/misskey/commit/ec203f7f795766f76b55fecc9248168c1cdf6c99 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-39169 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39169 · Vendor Advisory
• https://t.me/cibsecurity/27944 · Telegram Post