Vulnerability in Budibase
CVE-2026-72856
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Budibase — versions 0, 3.40.0
Weakness classification (CWE)
References
- github.com/Budibase/budibase/security/advisories/GHSA-j82g-67x3-xcwh (vendor-advisory)
- www.vulncheck.com/advisories/budibase-before-authentication-bypass-via-tenant-o… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72856?
- CVE-2026-72856 is a high-severity vulnerability in Budibase, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-08-13.
- How severe is CVE-2026-72856?
- High severity. CVSS v3 base score is 8.1 out of 10.