CVE-2026-73406 Budibase: Unauthenticated user information disclosure via public tenant user lookup endpoint
Unauthenticated attackers can access sensitive user details via a public API endpoint, exposing emails and identifiers in Budibase.
- 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-2026-73406?
CVE-2026-73406 is a high-severity 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 3.39.32, GET /api/global/users/tenant/:id was listed in PUBLIC_ENDPOINTS in packages/worker/src/api/index.ts, and tenantUserLookup returned a full PlatformUser document. An unauthenticated caller could query an email or user identifier, distinguish existing users from missing users, and obtain tenant identifiers, user identifiers, email addresses, SSO identifiers, and document revision metadata. This issue is fixed in version 3.39.32.
Weakness: CWE-200
Which versions are affected by CVE-2026-73406?
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-2026-73406?
No fix has been published for CVE-2026-73406 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-73406 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73406 exists.
Sources
Also known as GHSA-hr66-5mqr-8mpx.