CVE-2026-73409 Budibase: Server Filesystem Existence/Read Oracle via Builder-Controlled MongoDB tlsCertificateKeyFile
A builder can determine the existence and readability of server files by manipulating MongoDB TLS certificate paths, exposing sensitive filesystem information.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73409?
CVE-2026-73409 is a medium-severity vulnerability in budibase, published on 12 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-203
Which versions are affected by CVE-2026-73409?
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-2026-73409?
No fix has been published for CVE-2026-73409 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-73409 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73409 exists.
Sources
Also known as GHSA-ppr4-5f46-j9c6.