CVE-2026-42259

The record

Saltcorn is an extensible, open source, no-code database application builder. Prior to versions 1.4.6, 1.5.6, and 1.6.0-beta.5, Saltcorn validates the post-login dest parameter with a string check that only blocks :/ and //. Because all WHATWG-compliant browsers normalise backslashes (\) to forward slashes (/) for special schemes, a payload such as /\evil.com/path slips through is_relative_url(), is emitted unchanged in the HTTP Location header, and causes the browser to navigate cross-origin to an attacker-controlled domain. The bug is reachable on a default install and only requires a victim who can be tricked into logging in via a crafted Saltcorn URL. This issue has been patched in versions 1.4.6, 1.5.6, and 1.6.0-beta.5.

Affected packages

Related vulnerabilities

• GHSA-f3g8-9xv5-77gv Saltcorn: Open Redirect in `POST /auth/login` due to incomplete `is_relative_url`… Same vulnerability
• CVE-2026-41478 Saltcorn is an extensible, open source, no-code database application builder. Also affects @saltcorn/server
• GHSA-jp74-mfrx-3qvh Saltcorn: SQL Injection via Unparameterized Sync Endpoints (maxLoadedId) Also affects @saltcorn/server
• GHSA-32pv-mpqg-h292 Saltcorn has an Unauthenticated Path Traversal in sync endpoints, allowing arbitrary file… Also affects @saltcorn/server
• CVE-2026-40163 Saltcorn is an extensible, open source, no-code database application builder. Also affects @saltcorn/server
• GHSA-cr3w-cw5w-h3fj Saltcorn's Reflected XSS and Command Injection vulnerabilities can be chained for… Also affects @saltcorn/server
• CVE-2026-87945 URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal SAML SSO… CWE-601
• CVE-2026-87937 URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central… CWE-601