What’s Vulnerable › Vulnerabilities

CVE-2023-24811: Cross site scripting (XSS) vulnerability using url preview in Misskey

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-22 · updated 2026-06-17
• Weakness: CWE-79

Description

Misskey is an open source, decentralized social media platform. In versions prior to 13.3.2 the URL preview function is subject to a cross site scripting vulnerability due to insufficient URL validation. Arbitrary JavaScript is executed when a malicious URL is loaded in the `View in Player` or `View in Window` preview. This has been fixed in version 13.3.2. Users are advised to upgrade. Users unable to upgrade should avoid usage of the `View in Player` or `View in Window` functions.

Affected products

• misskey-dev misskey: before 13.3.2 — fixed in 13.3.2

How to fix

Upgrade to a fixed version: misskey-dev misskey 13.3.2. Check the vendor advisory for mitigations.

References

• https://github.com/misskey-dev/misskey/commit/38f9d1e76428bea47c5944c440eab25428c7d99e
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-vc39-c453-67g3
• https://github.com/misskey-dev/misskey/commit/38f9d1e76428bea47c5944c440eab25428c7d99e
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-vc39-c453-67g3

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