CVE-2026-104816High· 8.5▾ Twilight

Misskey is an open source, federated social media platform

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score47/ 100 · Moderate

impact 46.8 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Oct 13, 2026

Updated

Oct 16, 2026

CVSS

8.5

Vendor

misskey-dev

Product

misskey

CWE

CWE-79

Depth score

47 · Moderate

EPSS

0.63% · p50

Platforms

—

Source

NVD

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

decided 2026-10-13

Exploitation: none
Automatable: yes
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 15.

0.6% → 0.6%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

5 events · 3 days

Oct 13, 2026Published
Disclosed via NVD
Oct 15, 2026EPSS first tracked
0.6%
Oct 15, 2026CVSS changed
— → 8.5
Oct 15, 2026Severity changed
none → high
Oct 16, 2026Record revised
Last analysed / modified upstream

misskey-dev CWE-79 #nvd #cve.org

Affected

misskey >= 12.0.0, <= 13.14.2
misskey >= 2023.9.0-beta.1, < 2026.7.0

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026CVSS — → 8.5
Oct 15, 2026Severity none → high

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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