High 8.5Published Oct 13, 2026

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

Updated under an hour ago (2026-10-19 06:30 UTC)

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It affects misskey-dev misskey. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.63%, higher than 49% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 8.5 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.63% (percentile 49)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

misskey-dev misskey misskey_dev:misskey (from the name)	from 12.0.0, <= 13.14.2; from 2023.9.0-beta.1, < 2026.7.0	CNA record

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-p73x-6qrq-34jcx-refsource-confirm
https://github.com/misskey-dev/misskey/pull/17831x-refsource-misc
https://github.com/misskey-dev/misskey/commit/8dd59a8c06da49b8f302d902d73d04397ee29366x-refsource-misc
https://github.com/misskey-dev/misskey/releases/tag/2026.7.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.