CVE-2026-48717 PUBLISHED

OpenAM OAuth Authorization Bypass via PKCE Challenge

Assigner: GitHub_M
Reserved: 22.05.2026 Published: 15.09.2026 Updated: 15.09.2026

Open Access Management (OpenAM) is an access management solution. Prior to 16.1.1, AuthorizationCodeGrantTypeHandler requires a code_verifier only when the realm-wide codeVerifierEnforced setting is enabled, even when an authorization code stores a code_challenge. Because that setting is disabled by default, an attacker who intercepts a PKCE-protected authorization code can omit code_verifier and redeem the code, while an explicitly incorrect verifier is rejected. Public clients are directly affected, and confidential-client exploitation additionally requires client authentication material or another redemption context. This issue is fixed in version 16.1.1.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.1

Product Status

Vendor OpenIdentityPlatform
Product OpenAM
Versions
  • Version < 16.1.1 is affected

References

Problem Types

  • CWE-285: Improper Authorization CWE