IBM has released security updates to address a critical IBM API Connect vulnerability that could allow remote attackers to bypass authentication controls and gain unauthorized access to affected applications. The flaw, tracked as CVE-2025-13915, carries a CVSS 3.1 score of 9.8, placing it among the most severe vulnerabilities disclosed in recent months.
According to IBM, the IBM API Connect vulnerability impacts multiple versions of the platform and stems from an authentication bypass weakness that could be exploited remotely without any user interaction or prior privileges. Organizations running affected versions are being urged to apply fixes immediately to reduce exposure.
CVE-2025-13915: IBM API Connect Authentication Bypass Explained
The vulnerability has been classified under CWE-305: Authentication Bypass by Primary Weakness, indicating a failure in enforcing authentication checks under certain conditions. IBM said internal testing revealed that the flaw could allow an attacker to circumvent authentication mechanisms entirely.
The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) highlights the seriousness of the issue. The attack can be carried out over the network, requires low attack complexity, and does not depend on user interaction. If exploited, it could result in a complete compromise of confidentiality, integrity, and availability within the affected IBM API Connect environment.
IBM warned that a successful attack could grant unauthorized access to API Connect applications, potentially exposing sensitive data and backend services managed through the platform.
Affected IBM API Connect Versions
The IBM API Connect vulnerability affects specific versions within the 10.x release series. IBM confirmed that the following product versions are impacted:
- IBM API Connect V10.0.8.0 through V10.0.8.5
- IBM API Connect V10.0.11.0
API Connect is widely deployed in enterprise environments to manage APIs, control developer access, and secure integrations between internal and external services. As a result, vulnerabilities in the platform can have cascading effects across connected systems.
IBM Releases Fixes for IBM API Connect Vulnerability
To remediate CVE-2025-13915, IBM has issued interim fixes (iFixes) for all affected versions and strongly recommends that customers upgrade without delay.
For the 10.0.8.x branch, fixes have been released for each affected sub-version, including 10.0.8.1, 10.0.8.2 (iFix1 and iFix2), 10.0.8.3, 10.0.8.4, and 10.0.8.5. IBM has also provided an interim fix for IBM API Connect V10.0.11.0.
IBM emphasized that upgrading to the remediated versions is the most effective way to eliminate the authentication bypass risk associated with this vulnerability.
Workarounds and Mitigations for Unpatched Systems
For organizations unable to apply the fixes immediately, IBM has outlined a temporary mitigation to reduce risk. Administrators are advised to disable self-service sign-up on the Developer Portal, if that feature is enabled.
While this measure does not fully address the IBM API Connect authentication bypass vulnerability, IBM said it can help minimize exposure until patching is completed. The company cautioned that workarounds should only be used as a short-term solution.
Why the IBM API Connect Vulnerability Matters
Authentication bypass vulnerabilities are particularly dangerous because they undermine one of the most fundamental security controls in enterprise applications. In API-driven environments, such flaws can provide attackers with a direct path to sensitive services, data stores, and internal systems.
The vulnerability was published in the National Vulnerability Database (NVD) on December 26, 2025, and last updated on December 31, 2025, with IBM listed as the CNA and source.
Given the critical severity rating, security teams are expected to prioritize remediation and review API access logs for any signs of unauthorized activity. Organizations running affected versions of IBM API Connect are urged to assess their deployments immediately and apply the recommended fixes to prevent potential exploitation.