---
cve: "CVE-2026-72856"
severity: "HIGH"
cvss: 8.6
epss: "0.3%"
vendor: "budibase"
kev: false
exploited: false
published: "2026-08-13 22:17:24"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-28T23:25:43+02:00"
---

# CVE-2026-72856

> 8.6 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 661fe55d609404d073eea86702e0bde7942c3f10 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72856) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_