EUVD-2026-116118Published

traQ: XSS in the User Uploaded File Retrieval API

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cve-program · CVE-2026-63197

Published

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.

Source published: 3 Nov 2026 18:26:21 UTC
Source modified: 3 Nov 2026 22:40:46 UTC
Saved here: 3 Nov 2026 23:57:16 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 7.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

euvd · EUVD-2026-116118

Published

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datePublished: Nov 3, 2026, 6:26:21 PM

dateUpdated: Nov 3, 2026, 10:40:46 PM

Source published: Nov 3, 2026, 6:26:21 PM (timezone not stated)
Source modified: Nov 3, 2026, 10:40:46 PM (timezone not stated)
Saved here: 13 Nov 2026 22:08:34 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 7.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

nvd · CVE-2026-63197

Published

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Source analysis status: Deferred

Weakness classifications: CWE-79

Original publisher date fields

published: 2026-11-03T19:18:08.907

lastModified: 2026-11-12T22:18:51.470

Source published: 3 Nov 2026 19:18:08 UTC
Source modified: 12 Nov 2026 22:18:51 UTC
Saved here: 13 Nov 2026 22:01:12 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 7.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

osv · GHSA-p74g-f95m-7fx7

Published

### Impact For instances where `TRAQ_STORAGE_TYPE` is set to `local`, the file retrieval API `/files/{fileId}` could serve user-uploaded SVG or HTML files in a way that allowed them to be rendered directly in the browser. As a result, an attacker who can upload files to traQ could upload a crafted SVG or HTML file and trick a victim into opening the file URL, allowing the attacker to execute arbitrary JavaScript in the victim's browser. ### Patches This issue has been fixed in v3.28.3. After this fix, the file retrieval API always adds the `Content-Disposition` header to its responses regardless of the value of the `dl` query parameter. This prevents user-uploaded files from being displayed directly in the browser. ### Workarounds To mitigate the impact of this issue, apply either of the following workarounds: * Change `TRAQ_STORAGE_TYPE` to a storage backend other than `local`. * Ensure that all requests to `/files/{fileId}` include `dl=1`. Users of this application can reduce the risk of exploitation by avoiding suspicious file URLs.

Source published: 9 Nov 2026 20:52:49 UTC
Source modified: 9 Nov 2026 21:00:04 UTC
Saved here: 9 Nov 2026 21:04:16 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Publisher rating · HIGH