---
id: "CVE-2026-63197"
kind: "vulnerability"
aliases: ["CVE-2026-63197"]
title: "traQ: uploaded SVG or HTML files run script in victims' browsers"
severity: "high"
cvss: 7.3
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["file-upload", "other", "self-hosted", "traq"]
not_affected_if: ["managed-hosting", "non-local-storage"]
published_at: "2026-11-03T19:18:08+00:00"
first_seen_at: "2026-11-03T19:44:53+00:00"
updated_at: "2026-11-03T19:45:34+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63197", "first_seen_at": "2026-11-03T19:44:53+00:00"}]
---

# traQ: uploaded SVG or HTML files run script in victims' browsers

traQ, a messenger for the Digital Creators Club traP, serves user-uploaded SVG or HTML files directly from its /files/{fileId} endpoint when local storage is configured. An attacker who can upload a file can get JavaScript to run in another user's browser when that user opens the file URL.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the traQ version in use; versions before `3.28.3` are affected.
- Check whether `TRAQ_STORAGE_TYPE` is set to `local` in the deployment configuration.

## Fix

- Upgrade traQ to `3.28.3` or later.

## Timeline

- 2026-11-03T19:44:53+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-63197

## Documents

- [advisory] Vendor advisory: github.com https://github.com/traPtitech/traQ/security/advisories/GHSA-p74g-f95m-7fx7
- [fix] Patch: github.com https://github.com/traPtitech/traQ/commit/3db29e7771661f6418d88d186d8ff7817f5d6b6e
- [fix] Release notes: github.com https://github.com/traPtitech/traQ/releases/tag/v3.28.3

## From the sources

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.

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