CVE-2026-72856
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
Budibase versions before 3.40.0 contain an authorization/authentication bypass in the PUT /api/global/users/tenant/owner (changeTenantOwnerEmail) endpoint. On self-hosted instances (SELF_HOSTED or DISABLE_ACCOUNT_PORTAL set), the cloudRestricted middleware is a no-op and the route is protected only by a general authentication check, so any authenticated user — including a lowest-privilege BASIC app user — can reassign the tenant account-holder (top-privilege admin) email to an attacker-controlled address. The attacker can then use the public password-reset flow to take over the admin account, leading to full administrative access.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Budibase | budibase | 0 < 3.40.0 | affected |
| Budibase | budibase | 3.40.0 | unaffected |
Weaknesses
- CWE-640: Weak Password Recovery Mechanism for Forgotten Password
References
- https://github.com/Budibase/budibase/security/advisories/GHSA-j82g-67x3-xcwh
- https://www.vulncheck.com/advisories/budibase-before-authentication-bypass-via-tenant-owner-email
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