CVE-2026-73301 in Budibase
Summary
by MITRE • 08/12/2026
Budibase is an open-source low-code platform. Prior to 3.39.25, the GET /api/global/groups endpoint in packages/worker/src/api/routes/global/groups.ts omitted auth.builderOrAdmin, allowing an authenticated BASIC role user to enumerate tenant groups, role mappings and user memberships, builder permissions, and default-group flags. The disclosure exposes the tenant access-control structure to users who are not builders or administrators. This issue is fixed in version 3.39.25.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability identified in Budibase versions prior to 3.39.25 represents a critical authorization bypass flaw that undermines the platform's access control mechanisms. This issue manifests through the GET /api/global/groups endpoint which fails to properly enforce authentication checks, specifically missing the auth.builderOrAdmin middleware validation. The exposed endpoint operates within the packages/worker/src/api/routes/global/groups.ts file and provides unauthorized access to sensitive organizational data structures that should remain restricted to administrators and builders only. Such a flaw directly violates fundamental security principles of least privilege and role-based access control that are essential for maintaining secure multi-tenant environments.
The technical implementation of this vulnerability stems from an incomplete authentication check within the API route handler where the application fails to validate whether the requesting user possesses sufficient privileges to access global group information. An authenticated user with only BASIC role permissions can exploit this gap to retrieve comprehensive details about tenant groups, including role mappings, user memberships, builder permissions, and default-group flags that constitute the core access control infrastructure of the platform. This exposure effectively allows malicious actors or insider threats to gain detailed insights into the organization's security architecture and user permissions without proper authorization.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical intelligence for further exploitation attempts within the system. The leaked tenant access-control structure enables adversaries to understand how users are organized, what permissions are granted, and how the platform enforces access restrictions across different groups and roles. This information can facilitate more sophisticated attacks such as privilege escalation, targeted social engineering campaigns, or identification of potential attack vectors that could lead to unauthorized access to sensitive data or system functionality. The vulnerability affects all authenticated users regardless of their role level, making it particularly dangerous in environments where multiple user types exist within the same tenant.
Organizations utilizing Budibase versions prior to 3.39.25 face significant security risks as this vulnerability compromises the integrity of their access control mechanisms and exposes sensitive organizational data structures. The issue aligns with CWE-284 which describes improper access control vulnerabilities, and can be categorized under ATT&CK technique T1078 for valid accounts and T1566 for credential stuffing or privilege escalation scenarios. Security teams should immediately implement mitigation strategies including immediate upgrade to version 3.39.25 or later, followed by comprehensive monitoring of API access logs for suspicious activity patterns related to the exposed endpoint. Additional defensive measures include implementing network-level restrictions on the vulnerable API endpoints and conducting thorough security assessments to identify any potential exploitation attempts that may have occurred prior to the patch deployment. The vulnerability highlights the critical importance of proper authentication enforcement in multi-tenant applications and serves as a reminder that even seemingly minor implementation oversights can result in significant security implications for enterprise systems.