CVE-2026-126436
OpenEMR before 8.5.0 OAuth2 Grant Type Enforcement Bypass via Token Endpoint
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
OpenEMR before 8.5.0 contains an authorization bypass vulnerability that allows OAuth2 clients to use unregistered grant types because oauth_clients.grant_types is never enforced. Attackers can request tokens with grant_type=password to bypass the user consent screen, and disabled clients can redeem authorization codes using JWT client assertions.
| CWE | CWE-862 |
| Vendor | openemr |
| Product | openemr |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
openemr / openemr
0 < 8.5.0
References
Credits
🔍 sjpadgett