CVE-2026-104816 Misskey: Cross-site scripting in RSS feed item links
Attackers can execute scripts via malicious RSS feed links in Misskey, requiring an upgrade to the latest version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-104816?
CVE-2026-104816 is a high-severity cross-site scripting vulnerability in misskey-dev misskey, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-104816?
How do I fix CVE-2026-104816?
No fix has been published for CVE-2026-104816 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-104816 being exploited?
There is no known exploitation of CVE-2026-104816 in the wild and no public exploit code.
Sources
Also known as GHSA-p73x-6qrq-34jc.