Is CVE-2026-104816 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-104816 being exploited in the wild.

How severe is CVE-2026-104816?

Informational severity, published 13 October 2026.

Is there a fix for CVE-2026-104816?

Yes: fixed in 2026.7.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-104816 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-104816?

Check whether you run Misskey at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-104816: Misskey RSS widget XSS via unsafe URL scheme

CVE-2026-104816 · Severity: info · Published 2026-10-13

Misskey is a federated social media platform that supports RSS feed widgets. The RSS widget component fails to validate URL schemes in feed links, allowing an attacker who controls a feed to inject malicious links that execute scripts when users click them in the widget. This could lead to account compromise or data theft from affected users.

Technologies: Misskey. Vendors: Misskey.

Quick answers

Is CVE-2026-104816 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-104816 being exploited in the wild.
How severe is CVE-2026-104816?: Informational severity, published 13 October 2026.
Which products and versions are affected?: Misskey 12.0.0 to 2026.6.x.
Is there a fix for CVE-2026-104816?: Yes: fixed in 2026.7.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-104816 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-104816?: Check whether you run Misskey at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 2026.7.0

Technical details

The RSS widget displays feed item links without validating their URL schemes, allowing javascript: or data: URIs to be injected. An attacker controlling feed content can craft links that execute scripts in the browser context when clicked. This is a stored XSS vulnerability requiring the attacker to control a feed that a user subscribes to via the RSS widget.

Affected products

Misskey Misskey 12.0.0 to 2026.6.x

Timeline

2026-10-13: disclosed
2026-07-31: patched

References

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