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CVE-2026-63197— traQ: XSS in the User Uploaded File Retrieval API

Quick assessment

Affected
traPtitech traQ
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.

traQ 是一款专为 Digital Creators Club traP 打造的即时通讯应用。在 3.28.3 版本之前，若实例配置为 ，其 文件检索接口会返回用户上传的 SVG 或 HTML 内容，并直接在浏览器中渲染。拥有文件上传权限的攻击者可提交精心构造的活跃内容，诱导其他用户访问该文件 URL，从而在受害者浏览器中执行攻击者控制的 JavaScript 代码。该问题已在 3.28.3 版本中修复。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
traPtitech traQ < 3.28.3 affected
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I. Basic Information for CVE-2026-63197

Vulnerability Information
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Vulnerability Title
traQ: XSS in the User Uploaded File Retrieval API
Source: CVE Program / CVE List V5
Vulnerability Description
traQ is a messenger application built for Digital Creators Club traP. Prior to 3.28.3, instances configured with TRAQ_STORAGE_TYPE=local can return user-uploaded SVG or HTML content from the /files/{fileId} retrieval endpoint for direct browser rendering. An attacker with file-upload capability can provide crafted active content and induce another user to open its file URL, causing attacker-controlled JavaScript to execute in the victim's browser. This issue is fixed in version 3.28.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A: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
traPtitech traQ < 3.28.3 -

II. Public POCs for CVE-2026-63197

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III. Intelligence Information for CVE-2026-63197

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Other References for CVE-2026-63197 (3)

IV. Related Vulnerabilities

Same product: traQ
Same vendor: traPtitech
Same weakness: CWE-79