CVE-2026-53929
Description
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.
Summary dbcve.org
In NocoDB prior to 2026.05.1 with NC_SECURE_ATTACHMENTS enabled, a header key mismatch caused the Content-Disposition: attachment header to be dropped when serving uploaded files. The signed attachment handler stored overrides under PascalCase keys (ResponseContentDisposition) while the controller read under lowercase-hyphen names (response-content-disposition), causing Express to auto-render .html and .svg files inline from the NocoDB origin instead of forcing downloads.
Mitigation
Upgrade NocoDB to version 2026.05.1 or later to fix the header key mismatch that causes browsers to render malicious .html/.svg attachments inline instead of downloading them.