Cross-Site Scripting Vulnerability in traQ Messaging Application by traPtitech
CVE-2026-63197

7.3HIGH

Key Information:

Vendor

Traptitech

Status
Traq
Vendor
CVE Published:
3 November 2026

What is CVE-2026-63197?

The traQ messaging application developed by traPtitech has a vulnerability that allows for cross-site scripting (XSS) attacks. Prior to version 3.28.3, systems configured with TRAQ_STORAGE_TYPE set to local could inadvertently expose user-uploaded SVG or HTML content through the /files/{fileId} endpoint. This flaw enables an attacker, who has the capability to upload files, to create malicious content that, when opened by other users, executes arbitrary JavaScript code in their browsers. This vulnerability has been addressed in the fixed version, 3.28.3.

Affected Version(s)

traQ < 3.28.3

References

https://github.com/traPtitech/traQ/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/traPtitech/traQ/commit/3db29e7771661f6...
x_refsource_MISC
https://github.com/traPtitech/traQ/releases/tag/v3.28.3
x_refsource_MISC

CVSS V3.1

Score:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.