CVE-2026-53929
NocoDB: Stored Cross-Site Scripting via Secure Attachment
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, 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. 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. This vulnerability is fixed in 2026.05.1.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
NocoDB: Stored Cross-Site Scripting via Secure Attachment
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, 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. 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. This vulnerability is fixed in 2026.05.1.
- Record
CVE-2026-53929- CVSS 4.0
- 5.1 Medium
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-79
- Updated
- 2026-11-02
EUVDEUVD-2026-38602
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, 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. 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. This vulnerability is fixed in 2026.05.1.
- Record
EUVD-2026-38602- CVSS 4.0
- 5.1 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6mhr-74x2-98v9
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.
- Record
GHSA-6mhr-74x2-98v9- CVSS 4.0
- 5.1 Medium
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-79
- Updated
- 2026-11-02
NVD
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, 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. 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. This vulnerability is fixed in 2026.05.1.
- Record
CVE-2026-53929- CVSS 4.0
- 5.1 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
NocoDB: Stored Cross-Site Scripting via Secure Attachment
NocoDB is software for building databases as spreadsheets. Prior to 2026.05.1, 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. 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. This vulnerability is fixed in 2026.05.1.
- Record
CVE-2026-53929- CVSS 4.0
- 5.1 Medium
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-79
- Updated
- 2026-11-04
OSVGHSA-6mhr-74x2-98v9
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.
- Record
GHSA-6mhr-74x2-98v9- CVSS 4.0
- 5.1 Medium
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-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nocodbnpm |
through 0.301.3 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-53929 is a medium vulnerability (CVSS 5.1) in Nocodb, published June 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.