CVE-2026-72856 Budibase before 3.40.0 Authentication Bypass via Tenant Owner Email
Authenticated users on self-hosted Budibase instances can bypass authorization to change the admin email, enabling full administrative account takeover via password reset.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-72856?
CVE-2026-72856 is a high-severity authentication bypass vulnerability in budibase, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-640
Which versions are affected by CVE-2026-72856?
How do I fix CVE-2026-72856?
No fix has been published for CVE-2026-72856 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-72856 being exploited?
There is no known exploitation of CVE-2026-72856 in the wild and no public exploit code.
Sources
Also known as GHSA-796c-884r-78pp, GHSA-j82g-67x3-xcwh.