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

Quick assessment

Affected
misskey-dev misskey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Misskey 是一个开源的去中心化社交平台。从版本 12.0.0 至 2026.7.0，其 RSS 组件在未验证链接协议的情况下，直接显示来自已配置源的数据源中的项目链接。缺少对 URL 协议 schemes 的验证，使得攻击者通过控制数据源内容，可以插入具有不安全协议的链接。当用户点击 RSS 小部件中的此类链接时，可能导致脚本执行。该问题已在版本 2026.7.0 中修复。

CVSS 8.5 · High EPSS 0.63% · P49

Affected Version Matrix 2

VendorProduct Version RangeStatus
misskey-dev misskey >= 12.0.0, <= 13.14.2 affected
>= 2023.9.0-beta.1, < 2026.7.0 affected
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I. Basic Information for CVE-2026-104816

Vulnerability Information
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Vulnerability Title
Misskey: Cross-site scripting in RSS feed item links
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey >= 12.0.0, <= 13.14.2 -

II. Public POCs for CVE-2026-104816

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III. Intelligence Information for CVE-2026-104816

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Patches & Fixes for CVE-2026-104816 (2)

Vendor Advisories for CVE-2026-104816 (1)

Vendor Pages for CVE-2026-104816 (1)

Same Patch Batch · misskey-dev · 2026-10-13 · 3 CVEs total

CVE-2026-103937 8.7 HIGH Misskey: Denial of service resulting from insufficient cleanup processing during file uplo
CVE-2026-104817 8.7 HIGH Misskey: Lack of rate limiting and size restrictions in RSS fetching API

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-79

V. Comments for CVE-2026-104816

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