CVE-2026-82243 in Budibase
Summary
by MITRE • 08/28/2026
Budibase Server before 3.41.3 contains a server-side request forgery vulnerability in the datasource verify endpoint that allows builder-level users to supply arbitrary URLs without SSRF validation. Attackers can exploit this to leak internal CouchDB credentials by making requests to attacker-controlled servers, gaining full database access in cloud deployments.
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Analysis
by VulDB Data Team • 08/28/2026
The identified vulnerability resides within the Budibase server software prior to version 3.41.3 and specifically affects the datasource verification endpoint. This component is designed to test connectivity with external data sources configured by users during application development. The core technical flaw is a failure in input validation, which allows builder-level users to supply arbitrary Uniform Resource Locators without undergoing any Server-Side Request Forgery checks. In secure implementations, such endpoints must strictly validate and sanitize URLs to ensure they do not point to internal network resources or unauthorized external destinations that could be leveraged for malicious purposes. The absence of this validation logic creates a direct pathway for exploitation by authenticated users who possess builder privileges but lack higher-level administrative controls.
From an operational perspective, the impact of this vulnerability is severe due to its potential to facilitate data exfiltration and compromise internal infrastructure integrity. An attacker can exploit this flaw by crafting requests that target internal services or redirecting traffic through a server under their control. In cloud deployments where Budibase instances often have access to sensitive backend databases such as CouchDB, the ability to make arbitrary outbound requests enables an adversary to leak critical credentials stored within those systems. By capturing these credentials via the attacker-controlled endpoint, the threat actor gains full database access, which can lead to comprehensive data breaches, unauthorized modification of application logic, and further lateral movement within the network environment. This scenario highlights a significant risk in multi-tenant or cloud-hosted environments where internal service boundaries are not strictly enforced at the application layer.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-918, which describes Server-Side Request Forgery (SSRF). SSRF flaws occur when an application fetches a remote resource without validating the user-supplied URL, allowing attackers to cause the server to send requests to unexpected destinations. Furthermore, this exploitation technique maps to MITRE ATT&CK tactic T1598, specifically Phishing for Information from Cloud Infrastructure or Scraping Public Data depending on the specific target, but more accurately relates to T1071 Application Layer Protocol if used for command and control exfiltration of stolen credentials. The lack of validation represents a fundamental design oversight in how user-supplied data is handled during network operations initiated by the server itself rather than directly from the client browser.
To mitigate this risk, organizations running Budibase versions earlier than 3.41.3 should immediately upgrade to version 3.41.3 or later where these validation checks have been implemented. For environments that cannot be updated instantly, network-level controls such as firewall rules restricting outbound connections from the application server can provide a temporary layer of defense by blocking access to known malicious IP ranges and internal subnets. Additionally, implementing strict allow-listing for datasource URLs ensures that only pre-approved external services can be accessed during verification processes. Security teams should also audit existing builder accounts to ensure they are assigned minimal necessary privileges, reducing the attack surface available to potential insiders or compromised user credentials. Continuous monitoring of outbound traffic from application servers can help detect anomalous patterns indicative of SSRF exploitation attempts in real-time.