CVE-2026-6266: AAP Gateway Auth Bypass Vulnerability

CVE-2026-6266 Overview

CVE-2026-6266 is an authentication flaw in the Ansible Automation Platform (AAP) gateway. The user auto-link strategy, introduced in AAP 2.6, automatically links an external Identity Provider (IDP) identity to an existing AAP user account by matching the email address. The gateway does not verify that the IDP-supplied email is actually owned by the federated identity. A remote attacker who controls or manipulates an IDP-provided email can impersonate any AAP user, including administrators. The weakness is classified as [CWE-305] Authentication Bypass by Primary Weakness. Red Hat has published advisories RHSA-2026:13508, RHSA-2026:13512, and RHSA-2026:13545 to address the issue.

Critical Impact

An attacker with low privileges and the ability to influence IDP-asserted email values can hijack arbitrary AAP accounts, including administrative accounts, gaining full control over automation workflows and managed infrastructure.

Affected Products

• Red Hat Ansible Automation Platform 2.6 (AAP gateway component)
• Deployments using the user auto-link strategy with external Identity Providers
• Environments federating with IDPs that allow user-controlled or unverified email attributes

Discovery Timeline

• 2026-05-04 - CVE-2026-6266 published to NVD
• 2026-05-04 - Last updated in NVD database

Technical Details for CVE-2026-6266

Vulnerability Analysis

The AAP gateway introduced an auto-link feature in version 2.6 that connects an inbound IDP identity to an existing local AAP account when the email claim matches. The gateway treats the IDP-asserted email as a trusted identifier without performing ownership verification. An attacker who can register an account at, or otherwise manipulate, a federated IDP can set the email attribute to the address of a target AAP user. When the attacker authenticates through the IDP, the gateway links the attacker's IDP identity to the victim's pre-existing AAP account. The attacker then inherits the victim's roles, group memberships, and tokens within AAP. If the victim is an administrator, the attacker gains full platform control, including the ability to launch playbooks against managed hosts.

Root Cause

The root cause is missing primary-channel verification of an externally controlled identifier. The auto-link logic uses email equality as the sole binding criterion between an IDP subject and an AAP user. It does not require the email to be marked verified by the IDP, nor does it perform an out-of-band confirmation such as a verification link sent to the address. This pattern is the canonical [CWE-305] weakness: authentication relies on a primary attribute that the attacker can supply.

Attack Vector

The attack is remote and requires only low privileges, specifically the ability to authenticate to a federated IDP that AAP trusts. No user interaction from the victim is required. The attacker creates or modifies an IDP account so that its email attribute equals the victim's AAP email, then signs in to AAP through that IDP. The gateway auto-links the session to the victim's account, granting the attacker the victim's permissions.

No public proof-of-concept code is available. Refer to the Red Hat CVE Analysis CVE-2026-6266 and Red Hat Bug Report #2458142 for vendor-supplied technical details.

Detection Methods for CVE-2026-6266

Indicators of Compromise

• AAP gateway audit log entries showing a new IDP identity linked to an existing local user, where the IDP subject identifier differs from prior successful logins for that account.
• Successful AAP logins from IDP subjects whose accounts were created or had their email attribute changed shortly before the login.
• Administrative actions, token creation, or job template launches performed immediately after an unfamiliar IDP-to-user link event.

Detection Strategies

• Audit AAP gateway authentication logs for auto-link events and correlate the linked IDP sub claim against historical values for each user.
• Cross-reference IDP user creation timestamps and email-change events against AAP login events to identify suspicious just-in-time linking.
• Alert when a privileged AAP account receives a new IDP identity binding, especially when the IDP email_verified claim is false or absent.

Monitoring Recommendations

• Forward AAP gateway and IDP logs to a centralized analytics platform and build correlation rules around the auto-link action.
• Monitor for privilege use following any new IDP-to-user binding, including playbook launches against production inventories.
• Track IDP attribute mutations, particularly email changes, and treat changes targeting administrator addresses as high-severity events.

How to Mitigate CVE-2026-6266

Immediate Actions Required

• Apply the patches referenced in RHSA-2026:13508, RHSA-2026:13512, and RHSA-2026:13545 to all AAP 2.6 gateway instances.
• Inventory existing IDP-to-user links in the AAP gateway and revoke any bindings that cannot be attributed to legitimate user actions.
• Rotate API tokens and session credentials for any AAP user whose IDP binding cannot be verified.

Patch Information

Red Hat has released fixed packages through the advisories RHSA-2026:13508, RHSA-2026:13512, and RHSA-2026:13545. The patched gateway requires verified email ownership before auto-linking an IDP identity to an existing AAP account. Administrators should consult the Red Hat CVE Analysis CVE-2026-6266 page for the full list of impacted package versions and update procedures.

Workarounds

• Disable the user auto-link strategy in the AAP gateway configuration until patches are applied, requiring manual administrator approval for IDP-to-user bindings.
• Configure trusted IDPs to assert only verified email addresses and reject AAP logins where the email_verified claim is false.
• Restrict federation to IDPs that prevent end users from self-modifying the email attribute, and remove trust for IDPs that do not enforce email verification.

# Configuration example
# Refer to Red Hat advisories RHSA-2026:13508, RHSA-2026:13512, and RHSA-2026:13545
# for vendor-specified configuration steps to disable IDP auto-link or enforce
# verified-email binding in the AAP gateway.