Vulnerability · Published Oct 13, 2026 · Assigned by GitHub_M

CVE-2026-104816Misskey: Cross-site scripting in RSS feed item links

High 8.5

In plain English

A high-severity cross-site scripting in misskey from misskey-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 4.0)8.5High

Exploit odds (30 days)0.6%top 49.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Misskey is an open source, federated social media platform. From 12.0.0 until 2026.7.0, the RSS components display feed item links from configured feeds without verifying their URL schemes. Missing URL scheme verification allows an attacker who controls feed content to provide an unsafe-scheme link that causes script execution when a user clicks it in an RSS widget. This issue is fixed in version 2026.7.0.

Affected products (as reported)

Vendor	Product	Versions
misskey-dev	misskey	>= 12.0.0, <= 13.14.2>= 2023.9.0-beta.1, < 2026.7.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jc x_refsource_CONFIRM
https://github.com/misskey-dev/misskey/pull/17831 x_refsource_MISC
https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366 x_refsource_MISC
https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 x_refsource_MISC