Attack Chain

1. Attacker identifies a target user account within the AAP gateway.
2. Attacker creates an account on a configured external Identity Provider (IDP).
3. Attacker configures the IDP account with the same email address as the target user in the AAP gateway.
4. The target user attempts to authenticate to the AAP gateway using the configured IDP.
5. The AAP gateway, running version 2.6 or later, automatically links the attacker-controlled IDP identity to the existing AAP user account based on email matching, without verifying ownership.
6. The attacker successfully authenticates to the AAP gateway using the attacker-controlled IDP account, gaining access to the target user’s account.
7. If the hijacked account has administrative privileges, the attacker can escalate privileges and compromise the entire AAP gateway environment.

Impact

Successful exploitation of CVE-2026-6266 can lead to unauthorized access to sensitive data and systems managed by the AAP gateway. This includes the potential compromise of administrative accounts, which could allow an attacker to gain full control over the AAP environment. The vulnerability impacts organizations using AAP 2.6 and later for identity management. The potential consequences include data breaches, service disruption, and financial loss.

Recommendation

• Apply the patch provided in Red Hat Security Advisory RHSA-2026:13508 to remediate CVE-2026-6266.
• Monitor AAP gateway logs for successful authentications from unexpected IDPs to detect potential account hijacking attempts. Deploy a Sigma rule to detect this behavior.
• Implement multi-factor authentication (MFA) for all AAP accounts to mitigate the impact of successful account hijacking, even if the IDP is compromised.