Quick answers
- Is CVE-2026-12118 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-12118 being exploited in the wild.
- How severe is CVE-2026-12118?
- Critical severity, with a CVSS score of 9.8, published 30 July 2026.
- Which products and versions are affected?
- IBM webMethods Integration Server 10.15, 10.11.
- Is there a fix for CVE-2026-12118?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-12118 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-12118?
- Check whether you run IBM webMethods Integration Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A critical deserialization of untrusted data vulnerability (CWE-502) exists in the WmServiceMock package bundled with IBM webMethods Integration Server versions 10.15 and 10.11. The WmServiceMock package, intended as a development-time testing utility, does not implement its own authentication mechanism and relies on the Integration Server's settings. An unauthenticated remote attacker can exploit this by sending malicious serialized objects to the server, resulting in arbitrary code execution with the privileges of the Integration Server process. IBM has stated that no software patch is required; instead, the remediation is to manually delete the WmServiceMock package from all production and internet-facing nodes.
Affected products
- IBM webMethods Integration (on prem) 10.15, 10.11
Timeline
- 2026-07-02: disclosed: Initial publication by IBM
- 2026-07-30: advisory: NVD publication date