CVE-2026-104816CWE-79cross-site-scripting

CVE-2026-104816

published October 13, 2026

CVSS
8.5
EPSS
1%
Percentile
49.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.5 · NONE
CVSS v4.0
8.5 · 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
EPSS
0.00630 · 49.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-13T23:17Z
References (4)
https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366 · [email protected]https://github.com/misskey-dev/misskey/pull/17831 · [email protected]https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 · [email protected]https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jc · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 1%
    epss
  • 13 OCT 18:38Z
    Misskey: Cross-site scripting in RSS feed item links
    cvelistv5
  • 13 OCT 18:38Z
    Misskey: Cross-site scripting in RSS feed item links
    cvelistv5