External risk intelligence

IBM Verify Identity Access Buffer Overflow Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-11928

IBM Verify Identity Access is a product designed specifically for identity management, access control, and authentication. These services are typically deployed as public-facing identity portals, gateways, or edge services to facilitate remote user authentication, making them internet-accessible by design in common deployments.

Out-of-bounds Write

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

A critical vulnerability has been identified in IBM Verify Identity Access, a system used for managing user identities and access. This issue allows for a buffer overflow attack, which could potentially lead to significant compromise of confidentiality, integrity, and availability of the system. The main concern at this time is to confirm if this technology is in use and, if so, to what extent it may be exposed.

Software allows unauthorized remote code execution.
Critical identity management systems are at risk.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data to an internet-facing IBM Verify Identity Access component. This could lead to a buffer overflow, potentially allowing the attacker to execute arbitrary code or cause a denial of service.

No authentication required.
Triggered by sending malformed data.
Can lead to code execution or denial of service.

Live Threat

Current exploitation, exposure, and threat context

A buffer overflow vulnerability in IBM Verify Identity Access could allow an unauthenticated attacker to execute arbitrary code when specific conditions are met. This could impact the confidentiality, integrity, and availability of the affected system.

System data and service behavior.
Unauthenticated network access.
Code execution and system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for IBM Verify Identity Access, likely including application owners and platform or infrastructure teams, must first confirm where this technology is deployed. Subsequently, assess its exposure and business criticality to prioritize remediation efforts, potentially involving vendor coordination or temporary risk reduction measures.

Application owners should track deployment status.
Verify external reachability and business impact.
Plan remediation based on assessed 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?

IBM Verify Identity Access is a specialized software platform used by organizations to manage digital identities, control user access to resources, and facilitate secure authentication. It often serves as a centralized gateway or portal that verifies users before granting entry to applications and services.

What does a buffer overflow vulnerability mean in CVE-2026-11928?

This vulnerability is classified as CWE-787, which refers to an Out-of-bounds Write. It happens when software writes more data to a temporary memory storage area, or buffer, than it was designed to hold. This overflow can overwrite adjacent memory, potentially allowing an attacker to manipulate the program's behavior or execute unauthorized code.

How is CVE-2026-11928 triggered?

An attacker triggers this flaw by sending specially crafted, malformed data to the IBM Verify Identity Access component. Importantly, no prior authentication is required to initiate this process, meaning the system does not need to verify the user's identity before the malicious data can attempt to cause the overflow.

Why should I be concerned about my IBM Verify Identity Access deployment?

According to Halo Surface Signal, these systems are frequently deployed as public-facing identity portals or gateways to support remote user authentication. Because they are often intentionally placed at the network edge to be internet-accessible, they may be more reachable by unauthorized parties than internal-only applications.

What are the first steps to address this vulnerability?

If you are responsible for this technology, first confirm your organization's deployment footprint to identify all active instances. Once located, evaluate each instance's business criticality and network exposure. Work with your infrastructure and security teams to determine if temporary risk reduction measures are available while awaiting official vendor guidance.

References

www.ibm.com/support/pages/node/7286188

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.