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EUVD-2026-309090

2026-10-04T20:50:31.623171+00:00

EUVD-2026-309090

fkie_cve-2026-42239

2026-10-04T20:50:31.623204+00:00

Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie via document.cookie. This means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account. The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute. This issue has been patched in version 3.35.10.

GHSA-4f9j-vr4p-642r — Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover

2026-10-04T20:50:31.623280+00:00

Affected: npm: @budibase/backend-core

### Summary

The `budibase:auth` cookie containing the JWT session token is set with `httpOnly: false` at `packages/backend-core/src/utils/utils.ts:218`. JavaScript can read this cookie via `document.cookie`. Given that Budibase has had XSS vulnerabilities (GHSA-gp5x-2v54-v2q5 — stored XSS via unsanitized entity names, published April 2, 2026), this means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account.

The cookie also lacks `secure: true` (sent over plaintext HTTP) and `sameSite` attribute.

### Details

`packages/backend-core/src/utils/utils.ts`, lines 215-226:

```typescript const config: SetOption = { expires: MAX_VALID_DATE, path: "/", httpOnly: false, // ← JavaScript can read the session JWT overwrite: true, }

if (env.COOKIE_DOMAIN) { config.domain = env.COOKIE_DOMAIN }

ctx.cookies.set(name, value, config) ```

This function is called for setting the `budibase:auth` cookie which contains the signed JWT session token. With `httpOnly: false`, any JavaScript execution context (XSS, injected script, browser extension) can read the token via `document.cookie`.

Missing flags: - `httpOnly: false` → should be `true` (prevent JS access) - No `secure` flag → cookie sent over HTTP (should be `secure: true` for HTTPS deployments) - No `sameSite` → susceptible to cross-site request attachment (should be `sameSite: 'lax'`)

### PoC

Any XSS payload can steal the session:

```javascript // Att…

WID-SEC-W-2026-1412 — Budibase: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und potenziell Privilegieneskalation

2026-10-04T20:50:31.623339+00:00

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Budibase ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und potenziell um seine Privilegien zu erhöhen.