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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.
Read the publisher's advisorytraQ 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.
Read the publisher's advisorytraQ 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.
Read the publisher's advisory### 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.
Read the publisher's advisoryCISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.
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euvd · EUVD-2026-116118 · Published
nvd · CVE-2026-63197 · Published
euvd · EUVD-2026-116118 · Published
euvd · EUVD-2026-116118 · Published
nvd · CVE-2026-63197 · Published
osv · GHSA-p74g-f95m-7fx7 · Published
cve-program · CVE-2026-63197 · Published
cve-program · CVE-2026-63197 · Published