Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73409Budibase: Server Filesystem Existence/Read Oracle via Builder-Controlled MongoDB tlsCertificateKeyFile

Medium 5.1

In plain English

A medium-severity security flaw in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.3%top 75.0% 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, packages/server/src/integrations/mongodb.ts passed builder-controlled tlsCertificateKeyFile and tlsCAFile values directly to MongoClient on Budibase Cloud. A builder could submit absolute server paths through /api/datasources/verify and distinguish readable existing files from missing files by comparing the driver error, exposing a filesystem existence and readability oracle on the shared server. 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-ppr4-5f46-j9c6

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.40.1

Weakness: CWE-203 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/Budibase/budibase/security/advisories/GHSA-ppr4-5f46-j9c6 x_refsource_CONFIRM
https://github.com/Budibase/budibase/pull/19244 x_refsource_MISC
https://github.com/Budibase/budibase/commit/e58aa31e18272f6a1a8aeb525b7eef0b01b1dd43 x_refsource_MISC
https://github.com/Budibase/budibase/releases/tag/3.40.1 x_refsource_MISC