CVE-2026-73407 Budibase: Unauthenticated REST Datasource Credential Theft via Cross-Origin Auth Leak (bypass of CVE-2026-48152))
Unauthenticated attackers can steal stored REST datasource credentials by manipulating query paths to leak headers to attacker-controlled hosts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73407?
CVE-2026-73407 is a critical server-side request forgery vulnerability in budibase, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Budibase is an open-source low-code platform. Prior to 3.40.1, RestIntegration._req in packages/server/src/integrations/rest.ts attached credentials from getAuthHeaders and defaultHeaders without requiring the final request destination to match the datasource origin. An unauthenticated caller of a PUBLIC POST /api/v2/queries/:queryId query could supply an absolute or parameterized path to an attacker-controlled host and receive the stored bearer, basic, or static-header credentials. This issue is fixed in version 3.40.1.
Weakness: CWE-22
Which versions are affected by CVE-2026-73407?
2 open source packages ship an affected version, including @budibase/server.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/server npm | All versions to 3.38.1 | None |
@budibase/server npm | All versions to 3.38.1 | None |
How do I fix CVE-2026-73407?
No fix has been published for CVE-2026-73407 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73407 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73407 exists.
Sources
Also known as GHSA-mqhr-6j6h-74p5.