{"id":"CVE-2026-53929","aliases":["EUVD-2026-38602","GHSA-6mhr-74x2-98v9"],"status":"published","title":"NocoDB: Stored Cross-Site Scripting via Secure Attachment","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.","severity":{"version":"4.0","score":5.1,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00396,"percentile":0.34275,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-06-17T14:07:52Z","modified":"2026-11-04T02:47:46Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"nocodb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.301.3"}]}]},{"source":"osv","ecosystem":"npm","package":"nocodb","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.301.3"}]}]}],"products":[{"vendor":"nocodb","product":"nocodb"}],"references":[{"url":"https://github.com/nocodb/nocodb/security/advisories/GHSA-6mhr-74x2-98v9","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53929","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6mhr-74x2-98v9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53929.json","tags":["advisory"]},{"url":"https://github.com/nocodb/nocodb","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-53929","title":"NocoDB: Stored Cross-Site Scripting via Secure Attachment","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.","status":"published","published":"2026-06-23T19:44:19.94Z","modified":"2026-06-25T19:19:33.105Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:00.11477Z"}],"euvd":[{"id":"EUVD-2026-38602","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.","status":"published","published":"2026-06-23T19:44:19Z","modified":"2026-06-25T19:19:33Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"updated_at":"2026-11-02T18:20:25.316004Z"}],"ghsa":[{"id":"GHSA-6mhr-74x2-98v9","title":"NocoDB: Stored Cross-Site Scripting via Secure Attachment","description":"### Summary\nWith `NC_SECURE_ATTACHMENTS=true`, an authenticated uploader could deliver `.html` or\n`.svg` attachments that the browser rendered inline from the NocoDB origin instead of\nforcing a download.\n\n### Details\nThe signed attachment handler stored response-header overrides under PascalCase keys\n(`ResponseContentDisposition`, `ResponseContentType`) while the controller that served\nthe file read them under lowercase-hyphen names (`response-content-disposition`). The\nmismatch dropped the `Content-Disposition: attachment` header, leaving Express to\nauto-render `.html`, `.svg`, and similar inline. The fix corrects the key case and\nadditionally forces `Content-Disposition: attachment` and\n`Content-Type: application/octet-stream` for any MIME type not on the preview\nallowlist.\n\n### Impact\nStored Cross-Site Scripting in the NocoDB origin from inline-rendered uploads. Script\nexecuting in the victim's browser can read the auth JWT from `localStorage`.\nExploitation requires authenticated upload permission and the secure-attachment mode\nto be enabled.\n\n### Credit\nThis issue was reported by [@bugbunny-research](https://github.com/bugbunny-research).\nIt was independently reported by [@DavidCarliez](https://github.com/DavidCarliez).","status":"published","published":"2026-06-17T14:07:52Z","modified":"2026-07-20T21:20:14Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:40:47.245721Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-06-23T21:17:01.743Z","modified":"2026-06-25T20:17:15.4Z","cvss":[{"version":"4.0","score":5.1,"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/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","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:25.288279Z"}],"osv":[{"id":"CVE-2026-53929","title":"NocoDB: Stored Cross-Site Scripting via Secure Attachment","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.","status":"published","published":"2026-06-23T19:44:19.94Z","modified":"2026-11-04T02:47:46.866591859Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-04T02:53:00.786919Z"},{"id":"GHSA-6mhr-74x2-98v9","title":"NocoDB: Stored Cross-Site Scripting via Secure Attachment","description":"### Summary\nWith `NC_SECURE_ATTACHMENTS=true`, an authenticated uploader could deliver `.html` or\n`.svg` attachments that the browser rendered inline from the NocoDB origin instead of\nforcing a download.\n\n### Details\nThe signed attachment handler stored response-header overrides under PascalCase keys\n(`ResponseContentDisposition`, `ResponseContentType`) while the controller that served\nthe file read them under lowercase-hyphen names (`response-content-disposition`). The\nmismatch dropped the `Content-Disposition: attachment` header, leaving Express to\nauto-render `.html`, `.svg`, and similar inline. The fix corrects the key case and\nadditionally forces `Content-Disposition: attachment` and\n`Content-Type: application/octet-stream` for any MIME type not on the preview\nallowlist.\n\n### Impact\nStored Cross-Site Scripting in the NocoDB origin from inline-rendered uploads. Script\nexecuting in the victim's browser can read the auth JWT from `localStorage`.\nExploitation requires authenticated upload permission and the secure-attachment mode\nto be enabled.\n\n### Credit\nThis issue was reported by [@bugbunny-research](https://github.com/bugbunny-research).\nIt was independently reported by [@DavidCarliez](https://github.com/DavidCarliez).","status":"published","published":"2026-06-17T14:07:52Z","modified":"2026-07-20T21:30:33.06994727Z","cvss":[{"version":"4.0","score":5.1,"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","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:39.965326Z"}]}}