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TI-2026-84464 Aliases CVE-2026-63197

Cross-site scripting in traQ user uploaded file retrieval

Priority LOW 34CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

traQ, a messenger application built for Digital Creators Club traP, is affected before 3.28.3 when instances use TRAQ_STORAGE_TYPE=local. The /files/{fileId} retrieval endpoint returns user-uploaded SVG or HTML content for direct browser rendering, which is an improper neutralization of input during web page generation (CWE-79). An attacker with file-upload capability can provide crafted active content and induce another user to open its file URL, running attacker-controlled JavaScript in the victim's browser.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00286 21st percentileScored 2026-11-07
Fix Fixed traQ (traPtitech): 3.28.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
traPtitechtraQbefore 3.28.33.28.3Patch availableCNA
  • traQ VendortraPtitech Affected before 3.28.3 Fixed in 3.28.3 Patch available CNA

Remediation

Upgrade traQ to version 3.28.3, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA traQ (traPtitech) Fixed in 3.28.3

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-63197
  2. 2026-11-03 CISA SSVC decision points changed
  3. 2026-11-03 Priority changed: MEDIUM → LOW

References

Other 3

  • TI-2026-84468 Privilege escalation in traQ OAuth2 silent authorization CVSS 3.1HIGH 7.3
  • TI-2025-35696 Insertion of Sensitive Information into Log File in github.com/traPtitech/traQ CVSS 3.1MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences