{"id":"CVE-2026-47387","aliases":["GHSA-hj85-ph9q-78jg"],"url":"https://o3.security/vulnerability/CVE-2026-47387","summary":"NocoDB: Stored Cross-Site Scripting via Form View Redirect URL","details":"### Summary\n\nThe shared form-view submit handler in NocoDB writes the form's `redirect_url` to `window.location.href` after a same-host check that does not validate the URL scheme. A user with `editor` role (or above) on any base can plant a `javascript:` URL in the form's `redirect_url`; when an authenticated viewer opens the share-link and submits the form, the payload executes in the NocoDB origin and can read the session token from `localStorage[\"nocodb-gui-v2\"]`.\n\n### Details\n\nThe vulnerable sink is in `packages/nc-gui/composables/useSharedFormViewStore.ts`:\n\n- `isValidRedirectUrl` validated only `typeof === 'string'` and non-empty trim — no scheme check.\n- The submit branch built an anchor element, compared `anchor.host` to `window.location.host`, and either pushState-reloaded (same host) or assigned `window.location.href = redirectUrl` (otherwise).\n- For non-network schemes such as `javascript:`, `data:`, `vbscript:`, and `file:`, `anchor.host` is the empty string, so the same-host check is false and the code falls into the external-redirect branch — executing the URL same-origin in the NocoDB tab.\n\nThe `redirect_url` field is writable by any user with `editor` role on the base via the form-view PATCH endpoint, and the value is returned verbatim by the public shared-view meta endpoint, so no further privilege is required to weaponize a public form share.\n\n### Impact\n\n- **Same-origin script execution in the viewer's NocoDB tab.** The payload runs in the NocoDB origin and can read the session token at `localStorage[\"nocodb-gui-v2\"].token`.\n- **Action under the viewer's identity.** With the token, an attacker can call authenticated APIs as the viewer, scoped to whatever workspaces, bases, and operations that viewer is permitted to use.\n- **Single-click viewer flow.** Form share-links are the intended distribution channel for forms, so the phishing surface is on-brand; the form can be configured with a single hidden pre-filled required field to reduce the viewer flow to one click.\n\n### Credit\n\nThis issue was reported by [@kah-ja](https://github.com/kah-ja) ([turingpoint.de](https://turingpoint.de)).","published":"2026-06-23T20:11:02.071Z","modified":"2026-08-12T03:51:22.841553749Z","cvss":null,"epss":{"score":0.00234,"percentile":0.14582,"asOf":"2026-08-20"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"nocodb","fixedVersion":"2026.05.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47387.json"},{"type":"ADVISORY","url":"https://github.com/nocodb/nocodb/security/advisories/GHSA-hj85-ph9q-78jg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47387"},{"type":"PACKAGE","url":"https://github.com/nocodb/nocodb"},{"type":"WEB","url":"https://github.com/nocodb/nocodb/releases/tag/2026.05.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:22.841553749Z"}}