IBM has disclosed a critical authentication bypass vulnerability in its API Connect platform, tracked as CVE-2025-13915 and rated 9.8 on the CVSS scale. The flaw allows unauthenticated remote attackers to bypass authentication mechanisms and gain unauthorized access to applications managed by API Connect. Affected versions include 10.0.8.0 through 10.0.8.5 and 10.0.11.0, with IBM urging customers to apply the provided fixes immediately or, if unable, to disable self-service sign-up on the Developer Portal to reduce exposure. The vulnerability impacts organizations across various sectors, including banking, healthcare, and telecommunications, that rely on API Connect for API management in cloud, on-premises, or hybrid environments.
IBM has released detailed instructions for patching the vulnerability in VMware, OCP, and Kubernetes environments, and strongly recommends upgrading to the latest release to mitigate risk. While there is currently no evidence of exploitation in the wild, the severity and ease of exploitation make prompt remediation critical. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has previously highlighted IBM vulnerabilities as actively exploited, underscoring the importance of addressing this issue swiftly to prevent potential attacks.

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IBM publicly disclosed CVE-2025-13915, rated 9.8 CVSS, and released interim fixes for affected API Connect versions. The company also advised customers to disable Developer Portal self-service sign-up as a temporary mitigation if patching could not be done immediately.
IBM discovered a critical authentication bypass flaw in API Connect, tracked as CVE-2025-13915, during internal testing. The vulnerability affects versions 10.0.8.0 through 10.0.8.5 and 10.0.11.0 and can allow unauthenticated remote access.
The National Vulnerability Database published CVE-2025-13915, formally cataloging the critical IBM API Connect authentication bypass issue. This provided a public vulnerability record ahead of broader reporting.
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