CVE-2026-82246 in Server
Summary
by MITRE • 08/28/2026
Budibase Server before 3.41.3 contains a server-side request forgery vulnerability in the query import endpoint that fails to validate user-supplied URLs before fetching content. Attackers can submit arbitrary URLs to retrieve responses from internal services including cloud metadata endpoints and other restricted network resources.
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Analysis
by VulDB Data Team • 08/28/2026
The identified security flaw resides within Budibase Server versions prior to 3.41.3, specifically affecting the query import endpoint functionality. This component is designed to facilitate the ingestion of external data sources by allowing users or administrators to specify a Uniform Resource Locator from which content should be retrieved and processed into the application database. The core technical deficiency lies in the absence of rigorous input validation for these user-supplied URLs before the server initiates an outbound HTTP request. By failing to enforce strict allowlists on protocol schemes, IP address ranges, or domain names, the application inadvertently trusts maliciously crafted inputs provided by authenticated users with sufficient privileges to trigger this import mechanism. This lack of sanitization creates a classic Server-Side Request Forgery vector where the server acts as an intermediary proxy for arbitrary network requests initiated by the attacker rather than solely fetching legitimate external resources intended for data integration.
The operational impact of this vulnerability is significant, particularly in environments where Budibase instances are deployed within internal networks or cloud infrastructure that rely on security boundaries to protect sensitive backend services. An adversary exploiting this flaw can direct the vulnerable server to fetch content from internal-only endpoints that would otherwise be inaccessible from the public internet. A primary concern involves accessing cloud metadata service endpoints, such as those found in AWS EC2 instances at 169.254.169.254 or similar services on Azure and Google Cloud Platform. These endpoints often expose instance identity credentials, temporary security tokens, and configuration details that can be leveraged to escalate privileges within the cloud environment. Beyond cloud metadata, attackers may probe for internal database connections, administrative interfaces of other microservices, or legacy systems residing in private subnets, potentially leading to further compromise through credential theft or unauthorized data exfiltration from restricted network segments.
From a classification perspective, this vulnerability aligns with CWE-918, which defines Server-Side Request Forgery (SSRF). The failure to validate and restrict the destination of server-side requests allows an attacker to bypass access controls that would normally prevent direct interaction with internal resources. In terms of offensive security frameworks, this exploit maps directly to MITRE ATT&CK technique T1598, specifically sub-technique T1598.002 for Phishing for Information within a Multi-Tenant Environment if the attack involves social engineering to gain initial access, or more broadly T1496 Remote Service Discovery and T1537 Transfer Data to Cloud Account if the exfiltrated data is sent outward. The vulnerability represents a critical breach in network segmentation logic because it allows an application layer component to violate perimeter security assumptions by making requests on behalf of the server itself rather than the client browser, effectively neutralizing firewall rules that restrict external access but do not filter internal outbound traffic from trusted application servers.
Mitigation strategies must prioritize immediate patching and architectural hardening. The most effective remediation is upgrading Budibase Server to version 3.41.3 or later, where this validation logic has been corrected to enforce strict allowlists on permitted domains and protocols. For organizations unable to immediately upgrade due to operational constraints, network-level controls should be implemented to restrict outbound traffic from the server hosting Budibase. This includes configuring firewalls or proxy servers to block access to known cloud metadata IP ranges such as 169.254.169.254 and preventing connections to internal private IP address spaces unless explicitly required for business logic. Additionally, implementing a web application firewall with rules capable of detecting SSRF patterns in HTTP request parameters can provide an additional layer of defense by inspecting outbound requests for suspicious destination addresses or unusual protocol usage such as file:// or gopher:// schemes which are often exploited in advanced SSRF attacks to read local files on the server.