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

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

- fix: ghcr.io/traptitech/traq (ghcr): GitHub reports patched versions 3.28.3. Check the advisory for the affected release branch. (source: GitHub GHSA-p74g-f95m-7fx7) — https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7

## Affected products and versions

- traPtitech / traQ: < 3.28.3 (affected). Source: CNA: GitHub_M
-  / ghcr.io/traptitech/traq (ghcr.io/traptitech/traq): <3.28.3 (affected, GitHub advisory range). Source: GitHub GHSA-p74g-f95m-7fx7

## Severity and prioritization

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N; source: CNA: GitHub_M

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/traPtitech/traQ/commit/3db29e7771661f6418d88d186d8ff7817f5d6b6e (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/traPtitech/traQ/releases/tag/v3.28.3 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/traPtitech/traQ/commit/3db29e7771661f6418d88d186d8ff7817f5d6b6e (security-advisories@github.com)

- https://github.com/traPtitech/traQ/releases/tag/v3.28.3 (security-advisories@github.com)

- https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7 (security-advisories@github.com)

- https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7 (GitHub Security Advisories; advisory)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-63197; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-63197; retrieved 2026-11-04; source updated 2026-11-03

- GitHub Security Advisories: https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7; retrieved 2026-11-04; source updated 2026-07-16

Revision: ffa78f78403324f0381bedf8eb5009a2b1f99bf3f2a69f7959df04ad82fdaa97

Canonical: https://y2.dev/cve/CVE-2026-63197

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.