CVE-2026-48717 OpenAM OAuth Authorization Bypass via PKCE Challenge
Attackers can bypass PKCE protection to redeem intercepted authorization codes, potentially taking over accounts in OpenAM deployments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48717?
CVE-2026-48717 is a critical authentication bypass vulnerability in OpenIdentityPlatform OpenAM, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-285
Which versions are affected by CVE-2026-48717?
2 open source packages ship an affected version, including org.openidentityplatform.openam:openam-oauth2.
| Package | Affected | Fixed in |
|---|---|---|
org.openidentityplatform.openam:openam-oauth2 Maven | All versions | 16.1.1 |
org.openidentityplatform.openam:openam-oauth2 Maven | All versions | 16.1.1 |
How do I fix CVE-2026-48717?
Upgrade org.openidentityplatform.openam:openam-oauth2 to 16.1.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-48717 being exploited?
There is no known exploitation of CVE-2026-48717 in the wild and no public exploit code.
Sources
Also known as GHSA-4v2w-2wqp-mc85, UBUNTU-CVE-2026-48717.