GHSA-hj85-ph9q-78jg NocoDB: Stored Cross-Site Scripting via Form View Redirect URL

• npm nocodb: < 2026.05.1 → fixed in 2026.05.1

Summary The 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"]`. Details The vulnerable sink is in `packages/nc-gui/composables/useSharedFormViewStore.ts`: • `isValidRedirectUrl` validated only `typeof === 'string'` and non-empty trim — no scheme check. • 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). • 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. The `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. Impact • 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`. • 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. • 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. Credit This issue was reported by @kah-ja (turingpoint.de).