CVE-2026-53929

Description

### Summary With `NC_SECURE_ATTACHMENTS=true`, an authenticated uploader could deliver `.html` or `.svg` attachments that the browser rendered inline from the NocoDB origin instead of forcing a download. ### Details The signed attachment handler stored response-header overrides under PascalCase keys (`ResponseContentDisposition`, `ResponseContentType`) while the controller that served the file read them under lowercase-hyphen names (`response-content-disposition`). The mismatch dropped the `Content-Disposition: attachment` header, leaving Express to auto-render `.html`, `.svg`, and similar inline. The fix corrects the key case and additionally forces `Content-Disposition: attachment` and `Content-Type: application/octet-stream` for any MIME type not on the preview allowlist. ### Impact Stored Cross-Site Scripting in the NocoDB origin from inline-rendered uploads. Script executing in the victim's browser can read the auth JWT from `localStorage`. Exploitation requires authenticated upload permission and the secure-attachment mode to be enabled. ### Credit This issue was reported by [@bugbunny-research](https://github.com/bugbunny-research). It was independently reported by [@DavidCarliez](https://github.com/DavidCarliez).

How to fix CVE-2026-53929

No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.

• —no fix listed

Is CVE-2026-53929 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, <= 0.301.3

CVSS scores

References (3)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-53929
• PATCHgithub.com/nocodb/nocodb
• WEBgithub.com/nocodb/nocodb/security/advisories/GHSA-6mhr-74x2-98v9