CVE-2026-92804 in Nango
Summary
by MITRE • 09/16/2026
Nango through 0.70.4 fails to validate caller-supplied connection configuration values interpolated into provider token and proxy URL templates. Authenticated attackers can supply malicious configuration values to direct server requests at internal addresses or cloud metadata endpoints, potentially exfiltrating provider credentials.
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Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified in Nango versions through 0.70.4 represents a critical security flaw rooted in insufficient input validation within the application's connection management subsystem. Specifically, the software fails to properly sanitize caller-supplied configuration values that are subsequently interpolated into templates used for provider tokens and proxy URLs. This lack of rigorous validation allows authenticated attackers to inject malicious payloads directly into these dynamic strings. The core technical failure lies in the absence of strict allow-listing or pattern matching against expected formats for connection parameters, which permits the inclusion of characters or structures typically reserved for internal network addressing rather than public-facing service endpoints.
From a technical perspective, this flaw enables Server-Side Request Forgery (SSRF) attacks by manipulating how the application constructs outbound requests to third-party providers. When an authenticated user provides a configuration value containing an internal IP address, localhost reference, or cloud metadata endpoint URL, the application blindly interpolates this input into its request templates without verifying that the resulting destination is external and authorized. This behavior effectively bypasses standard network boundary controls because the malicious request originates from within the trusted server environment itself. Consequently, the attacker can force the Nango service to make HTTP requests to internal services, such as database servers, administrative interfaces, or cloud instance metadata endpoints like those found in AWS EC2 or Google Cloud Platform environments.
The operational impact of this vulnerability is severe, primarily due to its potential for credential exfiltration and lateral movement within a compromised infrastructure. By directing server requests toward cloud metadata endpoints, an attacker can retrieve temporary security credentials associated with the underlying compute instance. These credentials often possess broad permissions that allow access to other resources within the same virtual private cloud or project. Furthermore, by targeting internal provider token templates, attackers may be able to intercept or manipulate authentication flows, potentially gaining unauthorized access to connected third-party services such as Salesforce, Slack, or GitHub accounts managed through Nango. This not only compromises the integrity of individual user connections but also poses a significant risk to organizational data privacy and compliance with regulatory standards regarding sensitive information handling.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) categories including CWE-918 for Server-Side Request Forgery, which addresses flaws where a web server retrieves a specified resource from a user-supplied URL without validating the destination address. Additionally, it relates to CWE-20 Improper Input Validation, as the application fails to filter or reject dangerous inputs that could alter system behavior in unintended ways. In terms of offensive security frameworks, this exploit maps directly to MITRE ATT&CK technique T1598, specifically Phishing for Information within Cloud Environments, where attackers leverage compromised credentials and SSRF capabilities to harvest sensitive data from cloud metadata services.
To mitigate this risk, organizations running Nango versions prior to 0.70.4 should immediately upgrade to the latest patched version that implements strict input validation and URL allow-listing mechanisms. If upgrading is not immediately feasible, administrators can implement network-level controls such as egress filtering or firewall rules to restrict outbound connections from the Nango server to only known external provider domains while blocking access to private IP ranges and cloud metadata endpoints like 169.254.169.254 for AWS or similar addresses for other providers. Additionally, enabling detailed logging of outgoing requests can aid in detecting anomalous activity indicative of SSRF attempts during the interim period before a full patch deployment is executed.