CVE-2026-104816 Details
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.
A cross-site scripting (XSS) vulnerability has been identified in the RSS components of Misskey, an open-source federated social media platform. This vulnerability affects versions 12.0.0 prior to 2026.7.0. The issue arises because the RSS feed item links are displayed without verifying their URL schemes. This lack of validation allows an attacker controlling the feed content to inject unsafe-scheme links that execute scripts when clicked in an RSS widget.
Users can upgrade to Misskey version 2026.7.0 to address this vulnerability. Instructions for downloading this version are available on the Misskey GitHub repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 13, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366 | [email protected] | Source CodeVendor |
| https://github.com/misskey-dev/misskey/pull/17831 | [email protected] | Source CodeVendor |
| https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 | [email protected] | Release NotesVendor |
| https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jc | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Misskey | >= 12.0.0, < 2026.7.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 13, 2026 | New CVE Received | [email protected] |