CVE-2026-72856
Budibase before 3.40.0 Authentication Bypass via Tenant Owner Email
- State
- Published
- Severity
- 8.6 High
- Published
- Aug 13, 2026
- Updated
- Aug 17, 2026
- Reserved
- Aug 10, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | 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 | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-640 Weak Password Recovery Mechanism for Forgotten Password
Affected Products
| Product | Versions |
|---|---|
budibaseBudibase |
|
References
- GitHub Security Advisory (GHSA-j82g-67x3-xcwh)vendor-advisory
- VulnCheck Advisory: Budibase before 3.40.0 Authentication Bypass via Tenant Owner Emailthird-party-advisory
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