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EUVD-2026-309284

2026-10-08T16:07:29.048789+00:00

EUVD-2026-309284

fkie_cve-2026-42259

2026-10-08T16:07:29.048833+00:00

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.

GHSA-f3g8-9xv5-77gv — Saltcorn: Open Redirect in `POST /auth/login` due to incomplete `is_relative_url` validation (backslash bypass)

2026-10-08T16:07:29.048872+00:00

Affected: npm: @saltcorn/server

### Summary 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.

### Details Vulnerable function: `packages/server/routes/utils.js:393-395`

```js const is_relative_url = (url) => { return typeof url === "string" && !url.includes(":/") && !url.includes("//"); }; ```

The function's intent is to allow only same-origin redirects, but the allow-list only checks for two literal substrings. It does not handle: - backslash characters, which WHATWG URL parsing (used by every modern browser) treats as forward slashes for the special schemes `http`, `https`, `ftp`, `ws`, `wss`. A URL parser fed `/\evil.com/path` with a base of `http://victim/` resolves to `http://evil.com/path`. - non-`http(s):` schemes that do not contain `:/`. The strings `javascript:alert(1)`, `data:text/html,...`, `vbscript:...` all pass.

Vulnerable callsite: `packages/server/auth/routes.js:1371-1376`

```js } else if ( (req.body || {}).dest && is_relative_url(decodeURIComponent((req.body || {}).dest)) ) { res.red…