CVE-2026-72856

HIGH 8.1

Budibase before 3.40.0 Authentication Bypass via Tenant Owner Email

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-640
Vendor	budibase
Product	budibase
Published	Aug 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

Budibase / budibase

0 < 3.40.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Budibase/budibase/security/advisories/GHSA-j82g-67x3-xcwh vulncheck.com: https://www.vulncheck.com/advisories/budibase-before-authentication-bypass-via-tenant-owner-email

Credits

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