IBM has warned organizations using its API Connect platform about a severe security vulnerability that could allow unauthorized individuals to access applications remotely. The company has urged customers to apply security updates immediately to reduce the risk of exploitation.
API Connect is an enterprise-level platform designed to help organizations create, manage, and secure application programming interfaces, commonly referred to as APIs. APIs act as digital connectors that allow different software systems to communicate securely. Because these interfaces often expose internal services to external applications, business partners, and developers, they play a crucial role in modern digital operations.
IBM API Connect can be deployed in multiple environments, including on-premises infrastructure, cloud-based systems, and hybrid setups. Due to this flexibility, it is widely adopted across industries such as banking, healthcare, retail, and telecommunications, where secure data exchange is essential.
The vulnerability, identified as CVE-2025-13915, has been assigned a severity score of 9.8 out of 10, placing it in the highest risk category. According to IBM, the flaw affects API Connect versions 10.0.11.0 and 10.0.8.0 through 10.0.8.5.
At the core of the issue is a weakness in the platform’s authentication mechanism. Under certain conditions, an attacker could bypass login checks entirely and gain access to exposed applications without providing valid credentials. The attack does not require advanced technical skill or interaction from a legitimate user, which increases the potential risk.
If successfully exploited, this vulnerability could allow threat actors to reach applications that rely on API Connect as a gateway, potentially exposing sensitive systems and data. Given the role of APIs in connecting backend services, such access could have serious operational and security consequences.
IBM has released updated software versions that address the flaw and has strongly recommended that administrators upgrade affected systems as soon as possible. For organizations that are unable to deploy the updates immediately, IBM has outlined temporary mitigation steps. One key recommendation is disabling the self-service sign-up feature on the Developer Portal, which can reduce exposure until a full fix is applied.
The company has also provided detailed guidance for installing the updates across different environments, including VMware, OpenShift Container Platform, and Kubernetes-based deployments.
While IBM has not confirmed active exploitation of this specific vulnerability, U.S. cybersecurity authorities have previously flagged multiple IBM-related security flaws as being abused in real-world attacks. In recent years, several IBM vulnerabilities were added to the U.S. Cybersecurity and Infrastructure Security Agency’s catalog of known exploited vulnerabilities, requiring federal agencies to secure affected systems under Binding Operational Directive 22-01.
Some of those previously listed flaws were later linked to ransomware activity, underscoring the importance of addressing high-severity vulnerabilities promptly.
Security experts advise organizations using API Connect to verify their software versions, apply updates without delay, and monitor systems closely for unusual behavior. As APIs continue to form the backbone of digital services, maintaining strong authentication controls remains critical to reducing cyber risk.