CVE-2026-11877: OpenText Access Manager Auth Bypass Flaw

CVE-2026-11877 Overview

CVE-2026-11877 is a medium-severity vulnerability in OpenText Access Manager that allows an unauthorized user to modify product configuration through API calls. The flaw affects all releases of Access Manager prior to version 5.1.3. The weakness is classified under [CWE-648] (Incorrect Use of Privileged APIs), indicating that privileged configuration endpoints fail to enforce authentication or authorization checks. Network-based attackers can reach the exposed APIs without credentials and alter access management settings, which can degrade the integrity of authentication policies governed by the product.

Critical Impact
Unauthenticated network-accessible API endpoints permit configuration tampering in OpenText Access Manager, undermining identity and access policy integrity.

Affected Products

OpenText Access Manager versions prior to 5.1.3

Discovery Timeline

2026-06-24 - CVE-2026-11877 published to NVD
2026-06-24 - Last updated in NVD database

Technical Details for CVE-2026-11877

Vulnerability Analysis

OpenText Access Manager exposes administrative API endpoints that handle configuration changes. CVE-2026-11877 demonstrates that these endpoints accept and process configuration-modifying requests from clients that have not been authenticated or authorized. An attacker with network reachability to the management interface can issue API calls that alter product settings without holding any administrative role. Because Access Manager mediates federated authentication and single sign-on for downstream applications, unauthorized configuration changes can ripple into the broader identity infrastructure. The mapping to [CWE-648] reflects a control-plane gap where privileged operations are exposed without the privilege checks the operation requires. The vulnerability impacts integrity at the vulnerable component and produces low-impact secondary effects on confidentiality and integrity in the surrounding system, consistent with the published CVSS 4.0 metrics.

Root Cause

The root cause is missing or incorrectly applied authorization enforcement on configuration API routes. Requests that should require an authenticated administrative session are accepted from unauthenticated callers, allowing parameter values to be written to the product configuration.

Attack Vector

The attack vector is network-based. An attacker sends crafted HTTP/HTTPS API requests to the Access Manager administrative service. No credentials, user interaction, or local access are required, although exploitation conditions are non-trivial, which is reflected in the high attack complexity score. Successful requests modify configuration state, which can be used to weaken authentication policies, redirect federation flows, or stage further attacks against relying applications. No public proof-of-concept exploit and no exploitation in the wild have been reported for this CVE at publication time.

For technical details, see the Micro Focus Article on Issue KM000047450.

Detection Methods for CVE-2026-11877

Indicators of Compromise

Unexpected modifications to Access Manager configuration objects, policies, or federation trust settings without a corresponding administrative session in audit logs.
HTTP requests to administrative API paths originating from source IPs not associated with operator workstations or management subnets.
Configuration change events with missing or anonymous user attribution in product audit trails.

Detection Strategies

Review Access Manager audit and admin logs for configuration write operations and correlate each event with an authenticated administrator session ID.
Inspect reverse proxy and web application firewall logs for POST, PUT, or PATCH requests to administrative API endpoints lacking valid session cookies or bearer tokens.
Baseline normal configuration change frequency and alert on deviations, particularly outside scheduled change windows.

Monitoring Recommendations

Forward Access Manager logs to a centralized SIEM or data lake and apply detection rules targeting unauthenticated administrative API access.
Monitor for anomalous outbound authentication redirects, which can indicate that federation or SSO settings have been tampered with.
Enable file integrity monitoring on Access Manager configuration stores to capture changes for forensic review.

How to Mitigate CVE-2026-11877

Immediate Actions Required

Upgrade OpenText Access Manager to version 5.1.3 or later, where the authorization checks on the affected API endpoints are corrected.
Restrict network exposure of the Access Manager administrative interface to trusted management networks using firewalls or network ACLs.
Audit recent configuration changes and revert any modifications that cannot be tied to an authorized administrator.

Patch Information

OpenText addresses the issue in Access Manager 5.1.3. Refer to the vendor knowledge base entry Micro Focus Article on Issue KM000047450 for the official advisory, fixed build identifiers, and upgrade guidance.

Workarounds

Place the Access Manager administrative API behind a reverse proxy that enforces mutual TLS or IP allow-listing until the patch can be deployed.
Disable or block remote access to administrative API routes from non-management network segments.
Increase audit log retention and review frequency for configuration change events while remediation is pending.

bash

# Example: restrict access to the Access Manager admin interface to a management subnet
iptables -A INPUT -p tcp --dport 8443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -j DROP