Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73407Budibase: Unauthenticated REST Datasource Credential Theft via Cross-Origin Auth Leak (bypass of CVE-2026-48152))

Critical 9.0

In plain English

A critical-severity path traversal in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 4.0)9.0Critical

Exploit odds (30 days)0.5%top 54.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@budibase/server	no fix listed	GHSA-mqhr-6j6h-74p5

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.40.1

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N

References

https://github.com/Budibase/budibase/security/advisories/GHSA-mqhr-6j6h-74p5 x_refsource_CONFIRM
https://github.com/Budibase/budibase/pull/19239 x_refsource_MISC
https://github.com/Budibase/budibase/commit/8b1bca71501b11c68310351ef4f2c3028b2d5f08 x_refsource_MISC
https://github.com/Budibase/budibase/releases/tag/3.40.1 x_refsource_MISC