SEPTEMBER 17, 2026
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Case File

CVE-2026-40205

MEDIUM · CVSS 5.9 EPSS 0.18% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

An OAuth2 implementation is vulnerable due to improper scope validation, allowing attackers with partial scope tokens to authenticate successfully. This flaw compromises the intended authorization policy, potentially granting unauthorized access to sensitive resources. Organizations utilizing this OAuth2 configuration should prioritize remediation, particularly those managing sensitive data or critical applications.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-40205
Severity
MEDIUM
CVSS
5.9
EPSS
0.18%

Original NVD Description

An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote token validation paths accept a token that carries only one of them, while the local token validation path correctly requires all of them. The configured authorization policy is not enforced, so a token that was granted only part of the required permissions is accepted where it should have been rejected. Use local token validation where tokens can be validated locally. Update to non-vulnerable version. No publicly available exploits are known.