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Fencer Intel
high 7.3

CVE-2026-63197 json

traQ: XSS in the User Uploaded File Retrieval API

published 8d ago modified 2d ago also EUVD-2026-116118 , GHSA-p74g-f95m-7fx7

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/traPtitech/traQ 1.0.0-rc.2.0.20260627142846-3db29e777166

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
8d ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
GitHub 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/traPtitech/traQ
<1.0.0-rc.2.0.20260627142846-3db29e777166
1.0.0-rc.2.0.20260627142846-3db29e777166

Affected products

  • traPtitech traQ

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.