CVE-2026-73229 in Django REST Framework
Summary
by MITRE • 08/11/2026
Django REST framework is a powerful and flexible toolkit for building Web APIs. Prior to 3.17.2, Django REST Framework's rest_framework/renderers.py AdminRenderer.render() uses override_method() to simulate GET and directly invokes view.get() without view.check_permissions() while rendering an invalid write request, allowing a 400 Bad Request HTML response to disclose data from a GET representation that the requester is not permitted to access. This issue is fixed in version 3.17.2.
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Analysis
by VulDB Data Team • 08/11/2026
The vulnerability identified in Django REST Framework versions prior to 3172 affects the AdminRenderer.render() method within the rest_framework/renderers.py module. This flaw represents a critical authorization bypass that occurs during the rendering of invalid write requests, creating an unintended information disclosure channel. The issue stems from the renderer's improper handling of permission checks when simulating GET requests through the override_method() function.
The technical implementation involves the AdminRenderer.render() method calling override_method() which simulates GET requests to retrieve data for display purposes. However, this process directly invokes view.get() without first executing view.check_permissions(), bypassing the standard Django REST Framework permission checking mechanism that would normally validate whether the requesting user has adequate authorization to access the requested resource. This occurs specifically when rendering a 400 Bad Request response for invalid write operations.
When an unauthorized user attempts to perform a write operation that fails validation, the system generates a 400 error response but inadvertently exposes data from the corresponding GET representation through the HTML output. The underlying flaw allows attackers to potentially access sensitive information that would normally be restricted based on user permissions, effectively creating a data leakage scenario where the system reveals more information than intended during error handling.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables unauthorized users to gather intelligence about system resources and data structures through crafted invalid requests. This type of vulnerability aligns with CWE-200, which covers "Information Exposure," and represents a specific instance of improper access control during error condition processing. The issue affects all Django REST Framework applications that utilize the AdminRenderer and handle write operations with invalid data.
Security practitioners should consider this vulnerability in relation to ATT&CK technique T1213.001 for Data from Information Repositories, as it enables unauthorized data extraction through legitimate system error paths. The flaw demonstrates poor separation of concerns in error handling where authentication and authorization checks are not properly enforced during the rendering phase. Organizations using Django REST Framework versions before 3172 must apply the patch immediately to prevent potential exploitation.
The mitigation strategy involves upgrading to Django REST Framework version 3172 or later, which implements proper permission checking before rendering GET representations during error conditions. Additionally, administrators should review their application's error handling procedures and ensure that all renderer implementations properly enforce authorization checks regardless of request type or response status. This vulnerability underscores the importance of maintaining robust access control mechanisms throughout all code paths including error and exception handling routines, as highlighted in OWASP Top 10 2021 category A07:2021 - Identification and Authentication Failures.
The fix implemented in version 3172 ensures that view.check_permissions() is properly invoked before any GET representation data is accessed during invalid write request processing. This maintains the principle of least privilege by preventing unauthorized access to sensitive information through error response rendering while preserving the intended functionality of the API's administrative interface. The solution demonstrates proper defensive programming practices that align with security engineering principles and industry best practices for maintaining secure application behavior under all operational conditions.