CVE-2026-13019 in Portal for ArcGIS
Summary
by MITRE • 07/07/2026
Esri Portal for ArcGIS versions 12.1 and earlier on Windows, Linux and Kubernetes have a missing authentication for critical function vulnerability allows a remote, unauthenticated attacker to access an unprotected API.
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Analysis
by VulDB Data Team • 07/07/2026
This vulnerability affects Esri Portal for ArcGIS versions 12.1 and earlier across multiple operating systems including Windows, Linux, and Kubernetes deployments. The core issue stems from inadequate authentication mechanisms for critical functions within the application's API endpoints. An attacker can exploit this weakness to gain unauthorized access to protected functionalities without providing valid credentials or authentication tokens.
The technical flaw represents a classic authentication bypass vulnerability that violates fundamental security principles outlined in CWE-287 which addresses improper authentication issues. This weakness allows remote attackers to perform actions typically restricted to authenticated users, potentially enabling them to manipulate system configurations, access sensitive data, or execute administrative functions through unprotected API interfaces. The vulnerability's impact extends across all supported platforms, indicating a systemic flaw in the application's security architecture rather than an isolated component issue.
From an operational perspective, this vulnerability creates significant risk for organizations relying on Esri Portal for ArcGIS as it essentially provides a backdoor for unauthorized access to critical system functions. Attackers could potentially enumerate API endpoints, access user accounts, modify portal configurations, or even escalate privileges within the system. The remote nature of the exploit means that attackers do not require physical access to the network or system, making this vulnerability particularly dangerous for organizations with public-facing deployments.
The ATT&CK framework categorizes this vulnerability under privilege escalation and credential access techniques, specifically mapping to T1078 for valid accounts and T1566 for phishing attacks that could lead to exploitation. Organizations should immediately implement mitigations including applying the latest security patches released by Esri, configuring proper firewall rules to restrict API access, implementing additional authentication layers, and conducting thorough security assessments of their portal deployments. Network segmentation and monitoring solutions should be deployed to detect unauthorized API access attempts.
Security teams must also consider the broader implications for their defensive strategies, as this vulnerability demonstrates how critical system functions can remain exposed due to insufficient authentication controls. Regular vulnerability scanning and penetration testing should include verification of authentication mechanisms for all API endpoints, particularly those handling administrative or sensitive data operations. The remediation process requires careful coordination between security teams and application administrators to ensure that patch deployment does not disrupt existing portal functionality while addressing the authentication gap that leaves systems vulnerable to unauthorized access attempts.