What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-09-08
• Weakness: CWE-203

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 products

• budibase: before 3.40.1

References

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

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