---
title: "CVE-2026-104816: Misskey - Stored XSS"
description: "Misskey 12.0.0 < 2026.7.0 contains a stored XSS caused by missing URL scheme verification in RSS feed item links, letting attackers controlling feed content execute scripts when users click links in RSS widgets, exploit requires attacker to control feed content."
url: https://panop.io/threat-heartbeat/CVE-2026-104816/
---

# CVE-2026-104816 Misskey - Stored XSS

Misskey 12.0.0 < 2026.7.0 contains a stored XSS caused by missing URL scheme verification in RSS feed item links, letting attackers controlling feed content execute scripts when users click links in RSS widgets, exploit requires attacker to control feed content.

CVSS base score 8.5 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.63% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104816)

## Details

Type

Stored XSS

Impact

Stored XSS

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

13 October 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to version 2026.7.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104816](https://nvd.nist.gov/vuln/detail/CVE-2026-104816)
- [https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366](https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366)
- [https://github.com/misskey-dev/misskey/pull/17831](https://github.com/misskey-dev/misskey/pull/17831)
- [https://github.com/misskey-dev/misskey/releases/tag/2026.7.0](https://github.com/misskey-dev/misskey/releases/tag/2026.7.0)
- [https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jc](https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jc)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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