NocoDB: Stored Cross-Site Scripting via Secure Attachment
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. It was independently reported by @DavidCarliez.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | nocodb | <= 0.301.3 | no fix |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
nocodb- Disclosed
- 17.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6mhr-74x2-98v9 - CC BY 4.0
Vulnerability history: nocodb
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 54
- First → latest
- 06.2022 06.2026
- Without a fix
- 13
- Exploited in attacks
- 0
Severity breakdown
- High 7
- Medium 41
- Low 6
Disclosures per year
- 2022: 5
- 2023: 2
- 2024: 3
- 2025: 1
- 2026: 43
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NocoDB: Stored Cross-Site Scripting via Secure Attachment this entry
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