CVE-2026-63197: traQ: XSS in the User Uploaded File Retrieval API
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-11 15:49 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by GitHub_M, published 2026-11-03).
Weakness: CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’)
How it can be exploited
Exploitable over the network with low attack complexity needing low privileges and a user must take an action. Impact: confidentiality high, integrity high, availability none. CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 3 code repositories naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 7 references on Exploit Observer
Live scores
- EPSS
- 0.003
low predicted chance of attack - VEDAS
- 0.986
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| traPtitech traQ | version < 3.28.3 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-63197 traQ - Stored XSS via SVG/HTML file upload (local storage). Add them to your Suricata rule set and reload.
Show the rules
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-63197 traQ - Stored XSS via SVG/HTML file upload (local storage)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/v3/files"; nocase; fast_pattern; http.request_body; content:"filename="; nocase; pcre:"/(?:content-type:\s*(?:image\/svg|text\/html)|filename=[^\r\n]{0,200}\.(?:svg|xhtml|html?)\b|<\s*svg)/i"; classtype:web-application-attack; reference:cve,CVE-2026-63197; reference:url,https://www.exploit.observer/?keyword=CVE-2026-63197&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=traq&match=exact; sid:1105206; rev:1;)
CVE-2026-63197.rules on GitHub
References
Other references
- https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7 (x_refsource_CONFIRM)
- https://github.com/traPtitech/traQ/commit/3db29e7771661f6418d88d186d8ff7817f5d6b6e (x_refsource_MISC)
- https://github.com/traPtitech/traQ/releases/tag/v3.28.3 (x_refsource_MISC)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
Supporting partners
