CVE-2026-69238 in Portal for ArcGIS
Summary
by MITRE • 08/22/2026
There is an HTML injection vulnerability in Esri Portal for ArcGIS versions 11.5 and prior that allows a remote, highly priviliged attacker to insert arbitrary HTML into the Portal for ArcGIS Home application. Users working with ArcGIS Enterprise 11.1, 11.3, and 11.5 are encouraged to patch. All users are advised to upgrade to the latest long-term support release.
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Analysis
by VulDB Data Team • 08/22/2026
The vulnerability identified in Esri Portal for ArcGIS versions 11.5 and prior represents a significant security flaw classified as HTML injection, which is closely related to Cross-Site Scripting (XSS) vulnerabilities under common industry standards such as CWE-80. This specific weakness allows an attacker with high privileges within the application environment to inject arbitrary Hypertext Markup Language code into the Portal for ArcGIS Home application interface. Unlike typical XSS attacks that may be exploited by unauthenticated or low-privilege users through input fields, this vulnerability requires a remote actor who already possesses elevated permissions, indicating a potential abuse of legitimate administrative functions or compromised high-level credentials rather than an external injection via public-facing forms. The technical flaw stems from the application's failure to properly sanitize user-supplied data before rendering it in the web interface, allowing malicious scripts embedded within HTML tags to execute in the context of other users' browsers when they access the affected Home page.
From a threat modeling perspective aligned with the MITRE ATT&CK framework, this vulnerability facilitates techniques associated with Client-Side Code Injection and potentially Credential Access if the injected script is designed to harvest session cookies or credentials from victims who view the compromised content. The operational impact of such an injection can be severe for organizations relying on ArcGIS Enterprise environments, particularly those running versions 11.1, 11.3, and 11.5. An attacker leveraging this flaw could manipulate the user interface to display misleading information, redirect users to phishing sites, or execute arbitrary JavaScript that interacts with sensitive geospatial data stored within the portal. Since the injection occurs in the Home application, it affects a high-visibility area of the platform, increasing the likelihood of successful exploitation against multiple administrators and analysts who regularly access this dashboard for monitoring and management tasks.
The requirement for a highly privileged attacker suggests that while the impact is severe due to the potential for widespread client-side compromise, the initial attack vector may be limited by the need for significant internal trust or prior compromise of an administrative account. However, in enterprise environments where lateral movement occurs after an initial breach, this vulnerability serves as a potent tool for escalating damage and maintaining persistence within the user experience layer. It highlights the risk associated with stored persistent injections that do not require immediate interaction triggers but remain active until patched, affecting all subsequent visitors to the portal interface during the window of exposure.
To mitigate these risks, Esri strongly advises users operating ArcGIS Enterprise versions 11.1, 11.3, and 11.5 to apply the latest available patches immediately. These updates address the input validation deficiencies that allow HTML content to be rendered without proper encoding or escaping. Furthermore, all organizations are encouraged to upgrade to the most recent long-term support release of ArcGIS Enterprise to benefit from comprehensive security hardening measures and ongoing vulnerability management. Implementing strict access controls for administrative accounts and monitoring for unusual activity in high-privilege user sessions can also provide an additional layer of defense against exploitation attempts that seek to leverage this specific injection capability within the portal infrastructure.