8.6

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-57817

CVE-2025-57817: Fides Webserver API is Vulnerable to OAuth Client Privilege Escalation

Fides is an open-source privacy engineering platform. Prior to version 2.69.1, the OAuth client creation and update endpoints of the Fides Webserver API do not properly authorize scope assignment. This allows highly privileged users with client:create or client:update permissions to escalate their privileges to owner-level. Version 2.69.1 fixes the issue. No known workarounds are available.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-57817

CVE-2025-57817:

8.6

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable YesTech Impact Total

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
ethyca-fides	pip	< 2.69.1	2.69.1

Technical Details

Vulnerability Intelligence
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Root Cause Analysis

The vulnerability allowed for privilege escalation because the endpoints for creating and updating OAuth clients did not validate if the requesting user had the authority to assign the specified scopes. The analysis of the patch commit 2ffd125e1089a09b84c27fb5279a05960cbf2452 clearly shows the addition of a security check in two key functions within src/fides/api/api/v1/endpoints/oauth_endpoints.py.

The create_client and set_client_scopes functions were modified to include a call to the new verify_client_can_assign_scopes utility function. This new function, added in src/fides/api/oauth/utils.py, checks if the scopes being assigned are a subset of the scopes possessed by the requesting client's token. Before this fix, these functions only validated that the scopes existed in the system's scope registry, but not that the user was authorized to grant them. This allowed a user with basic client management permissions (client:create or client:update) to create or modify a client and assign it owner-level scopes, thereby gaining unauthorized access to administrative functionalities. The vulnerable functions are the entry points for this privilege escalation vector, and their modification is direct evidence of the vulnerability's location.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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