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Violation of Secure Design Principles, Hidden Functionality, Incorrect Provision of Specified Functionality vulnerability in ArcGIS (Authentication) allows Privilege Abuse, Manipulating Hidden Fields, Configuration/Environment Manipulation.

The ArcGIS client_credentials OAuth 2.0 API implementation does not adhere to the RFC/standards; This hidden (known and by-design, but undocumented) functionality enables a requestor (Referred to as client in RFC 6749) to request an, undocumented, custom token expiration from ArcGIS (Referred to as authorization server in RFC 6749).

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber

CWE-657

CWE-684

CWE-912

https://developers.arcgis.com/documentation/security-and-authentication/

https://www.vulsec.org/advisories