CVE-2026-63727 Overview
CVE-2026-63727 is a privilege escalation vulnerability in the Anchore Enterprise user management API. The flaw affects Anchore Enterprise versions 5.11.0 through 5.27.1, and 6.0.0. An authenticated attacker with access to the Anchore Enterprise API can issue a crafted request that modifies user permissions. This grants access to additional resources and operations beyond the attacker's original authorization. The system-admin role cannot be assigned through this flaw, but a read-only user can be elevated to write access. Anchore released fixes in versions 5.27.2 and 6.0.1. The vulnerability is tracked under CWE-648: Incorrect Use of Privileged APIs.
Critical Impact
An authenticated read-only user can escalate to write access on the Anchore Enterprise API, enabling tampering with container image scans, policies, and other protected resources.
Affected Products
- Anchore Enterprise 5.11.0 through 5.27.1
- Anchore Enterprise 6.0.0
- Anchore Enterprise user management API
Discovery Timeline
- 2026-07-28 - CVE-2026-63727 published to NVD
- 2026-07-28 - Last updated in NVD database
Technical Details for CVE-2026-63727
Vulnerability Analysis
Anchore Enterprise exposes a user management API for administering accounts, roles, and permissions. The API fails to properly restrict which permission modifications an authenticated caller can perform on their own or other users. An attacker with valid API credentials can invoke the endpoint to add write-tier permissions to a lower-privileged account.
The vulnerability enables horizontal and vertical privilege escalation within the application's role model. It does not allow assignment of the system-admin role, which remains protected. However, the ability to move from read-only to write access is sufficient to modify policies, mappings, and image evaluation outcomes across the platform.
Root Cause
The root cause is improper authorization enforcement on the user management API, categorized as [CWE-648]. The endpoint validates authentication but does not fully validate whether the calling principal is authorized to grant the requested permission set. Anchore's release notes for 5.27.2 document the fix in the user management authorization layer. See the Anchore Release Notes 5.27.2 for vendor details.
Attack Vector
The attack requires network access to the Anchore Enterprise API and valid low-privilege credentials. The attacker sends an API request to the user management endpoint that modifies role or permission assignments for a target user, including themselves. After the request succeeds, the elevated account can call write-capable API operations. Refer to the VulnCheck Advisory: Anchore Privilege Escalation for additional exploitation context.
No verified public exploit code is available at time of publication.
Detection Methods for CVE-2026-63727
Indicators of Compromise
- Unexpected API calls to Anchore Enterprise user management endpoints from non-administrative accounts.
- User accounts whose permissions changed without a corresponding administrative change ticket.
- Read-only accounts subsequently performing write operations such as policy updates or mapping changes.
Detection Strategies
- Audit Anchore Enterprise access logs for permission-modification API calls issued by non-admin principals.
- Compare current role and permission assignments against a known-good baseline exported before upgrading.
- Alert on any elevation transitions from read-only to write access outside change-management windows.
Monitoring Recommendations
- Forward Anchore Enterprise API and audit logs to a centralized SIEM for correlation and long-term retention.
- Monitor authentication events for the API and flag credential reuse from unexpected source addresses.
- Track policy, mapping, and image evaluation changes and reconcile them against authorized user activity.
How to Mitigate CVE-2026-63727
Immediate Actions Required
- Upgrade Anchore Enterprise to version 5.27.2 or 6.0.1 without delay.
- Rotate API credentials for all Anchore Enterprise users after upgrading.
- Review current user permission assignments and revert any unauthorized elevations.
Patch Information
Anchore fixed CVE-2026-63727 in Anchore Enterprise 5.27.2 and 6.0.1. Administrators running any version from 5.11.0 through 5.27.1, or 6.0.0, must upgrade. Consult the Anchore Release Notes 5.27.2 for upgrade procedures and validation steps.
Workarounds
- Restrict network access to the Anchore Enterprise API to trusted management networks until patching is complete.
- Reduce the number of accounts with API credentials to the minimum required for operations.
- Increase audit log retention and review frequency for the user management API endpoints.
# Verify installed Anchore Enterprise version and upgrade target
anchorectl system status
# Expected fixed versions: 5.27.2 or 6.0.1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
