External risk intelligence

IBM Verify and Security Verify Access Authentication Bypass Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-4101

The affected products, IBM Security Verify Access and IBM Verify Identity Access, are identity and access management solutions typically deployed as public-facing gateways or authentication portals to control access to enterprise applications. Because these services are designed to manage and authenticate external or internal users at the network edge, they are inherently exposed to network-based access.

Authentication Bypass

Ibm Security Verify Access

10.0.0.0 to 10.0.9.111.0.0.0 to 11.0.2.0

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability impacts IBM's identity and access management products, potentially allowing unauthorized access to applications under specific load conditions. The main concern is to confirm if these products are in use and if the exposure scenario is relevant to our environment.

Unauthorized access to applications is possible.
Safeguards critical user identity and access systems.
Confirm relevance and understand potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by targeting the IBM Verify or Security Verify Access products, potentially over the network, particularly when the system is under specific load conditions. Successful exploitation could allow the attacker to bypass authentication and gain unauthorized access to the application.

Attacker needs network access.
Triggered by specific load conditions.
Risk of unauthorized access.

Live Threat

Current exploitation, exposure, and threat context

Under certain load conditions, an attacker could bypass authentication for IBM Verify Identity Access and IBM Security Verify Access, potentially leading to unauthorized access to applications.

Application authentication mechanisms.
Bypass authentication under load.
Unauthorized application access.

Operational Fix

Recommended remediation, mitigation, and detection steps

Ownership of this critical authentication bypass vulnerability likely falls to platform or infrastructure teams managing the IBM Verify and Security Verify Access products, with collaboration from security and application teams. The initial priority is to inventory all instances of the affected software, assess their exposure and business criticality, and identify the specific application or service owners. This information will guide the development of a targeted remediation plan, which may involve vendor coordination or temporary mitigation strategies.

Identify affected installations and owners.
Verify external accessibility and criticality.
Plan remediation based on confirmed risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is IBM Verify Identity Access and Security Verify Access?

These are identity and access management (IAM) solutions used by enterprises to control user login and authorization. Often deployed as gateways or portals at the network edge, they act as the gatekeeper for applications. By managing how users prove their identity before accessing protected corporate resources, these tools serve a central role in securing enterprise traffic.

How does CVE-2026-4101 bypass authentication?

This vulnerability is classified as CWE-287, or Improper Authentication. In the context of CVE-2026-4101, a weakness in how the software validates identity allows an attacker to enter the system without providing valid credentials. It essentially tricks the software into granting access as if the attacker were an authorized user, skipping the security checks that should normally block them.

Does this authentication bypass always happen?

No, it is not constant. The flaw is triggered specifically by certain system load conditions. This means the authentication mechanism may function normally during standard operations but could fail to verify users correctly when the system is under stress or high traffic. Simply accessing the service is not enough to trigger the bypass without those specific, concurrent load factors present.

Why should I care about CVE-2026-4101?

According to Halo Surface Signal, these products are designed to sit at the network edge as gateways, meaning they are frequently exposed to the internet to handle remote or external user authentication. If your instance is internet-facing, it is directly reachable by external actors. Even internal deployments should be prioritized, as any compromise of this central security layer could grant broad access to your linked enterprise applications.

What is the first step to address this issue?

Begin by auditing your infrastructure to create a complete inventory of all IBM Verify Identity Access and IBM Security Verify Access instances. Once identified, map these installations to their respective system owners and evaluate their network exposure. This baseline of where and how the software is running is essential for determining your priority level before applying vendor-supplied updates or mitigation measures.

References

www.ibm.com/support/pages/node/7268253

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.