CVE-2026-88892 in OpenPanel
Summary
by MITRE • 09/10/2026
OpenPanel is an analytics platform. In all versions (no patched release available at time of publication), the data importer fetches a caller-supplied URL with plain fetch instead of the project's existing SSRF guard (apps/api/src/utils/safe-fetch.ts). In packages/importer/src/providers/umami.ts, parseRemoteFile calls fetch() on config.fileUrl, which is validated only by z.string().url(), so values such as http://127.0.0.1:9911/ or http://169.254.169.254/latest/meta-data/ are accepted; the shared createFileImportConfig factory gives the plausible provider the same field. An authenticated organization member — including a default 'member' with no project_access rows, for whom the intended access-level check is skipped because getProjectAccess returns boolean true rather than a level object — can therefore make the server connect to any address reachable from it. The resulting HTTP status and status text are persisted as Import.errorMessage and returned by import.get to the same user, providing a scanning oracle for internal hosts, ports and paths; if an internal response parses as Umami CSV, its rows are ingested as events and become readable in the attacker's analytics views.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified in OpenPanel represents a critical Server-Side Request Forgery (SSRF) flaw rooted in inconsistent security control implementation within the data import functionality. The application utilizes an existing SSRF guard mechanism located at apps/api/src/utils/safe-fetch.ts to validate and restrict outbound network requests, ensuring that internal or sensitive addresses are not accessed inadvertently. However, this protective measure is bypassed because a separate code path in packages/importer/src/providers/umami.ts invokes the standard fetch() function directly on user-supplied URLs without applying the same validation logic. This architectural inconsistency allows an attacker to circumvent network-level restrictions by targeting specific import providers that do not enforce the shared security protocols, effectively creating a blind spot in the application's defense-in-depth strategy.
The technical root cause lies in insufficient input validation and flawed access control checks for authenticated users. The configuration file URL is validated only against a basic string format using z.string().url(), which accepts any syntactically valid Uniform Resource Identifier without verifying its destination or scheme restrictions. Consequently, attackers can supply internal IP addresses such as 127.0.0.1 or cloud metadata endpoints like 169.254.169.254/latest/meta-data/. Furthermore, the vulnerability is exacerbated by a logic error in the access control mechanism where getProjectAccess returns boolean true for default member accounts lacking specific project_access rows instead of returning an object representing the actual permission level. This oversight allows even users with minimal privileges to trigger the vulnerable import functionality, as the intended authorization checks are effectively skipped due to this type confusion or improper return value handling.
The operational impact of this vulnerability is severe, enabling both unauthorized network reconnaissance and potential data exfiltration from internal services. By leveraging the SSRF capability, an authenticated attacker can use the application server as a proxy to scan internal networks, identifying open ports, running services, and accessible paths on hosts that are otherwise isolated from external access. The application provides a scanning oracle by persisting HTTP status codes and text into Import.errorMessage fields, which are then returned to the requesting user via import.get endpoints. This feedback loop allows for precise enumeration of network resources based on response variations. Additionally, if an internal service returns data in Umami CSV format, it is ingested as analytics events and becomes visible within the attacker's dashboard, facilitating the extraction of sensitive information from backend systems that may contain proprietary business logic or user data.
This vulnerability aligns with CWE-918 Server-Side Request Forgery (SSRF) due to the ability to make the server perform requests on behalf of an unauthorized actor, and it also reflects CWE-20 Improper Input Validation regarding the lack of rigorous URL scheme and destination checking. From a tactical perspective, this maps to ATT&CK technique T1571 Non-Standard Port as well as T1648 Supply Chain Compromise if used to target upstream dependencies, though primarily it serves reconnaissance purposes akin to T1046 Network Service Discovery. Mitigation strategies must prioritize the immediate enforcement of SSRF protections across all outbound request pathways by ensuring that every fetch invocation utilizes the established safe-fetch utility or an equivalent validation layer. Input validation should be strengthened to explicitly whitelist allowed domains and block private IP ranges, cloud metadata endpoints, and loopback addresses at the network level rather than relying solely on syntactic URL checks. Additionally, access control logic must be audited to ensure that permission checks return consistent data structures and properly enforce role-based restrictions for all user types, including default members with limited privileges.