KAMSOFT ZSIRep library certificate flaw patched
KAMSOFT's ZSIRep CLIENT library skips HTTPS certificate validation, letting MITM attackers intercept medical data; fixed in version 2.12.3.1.
Sourcecert.pl — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT Polska coordinated disclosure of CVE-2026-113618, a CWE-295 Improper Certificate Validation flaw in KAMSOFT's ZSIRep CLIENT library (ZSIREP.CLIENT.DLL). The library registers a process-wide .NET callback that accepts any TLS certificate without verification, allowing a man-in-the-middle attacker to impersonate the ZSIRep server and intercept or tamper with authentication data and documents exchanged over HTTPS. Notably, the malicious callback persists globally within the application process even after the client is closed, potentially weakening the security of other, unrelated HTTPS connections made by the same host application.
The vulnerable library is embedded in several KAMSOFT healthcare products: KS-SOMED, KS-PPS, KS-MEDIS, KS-SOLAB, and KS-ASW. All versions of the library prior to 2.12.3.1 are affected. Each dependent product has received its own patched release (e.g., KS-SOMED 2026.03.0.01, KS-PPS 2026.03.1.0, KS-MEDIS 2026.03.0.0, KS-SOLAB 2026.3.1.0, KS-ASW 2026.3.0.1). There is no indication of in-the-wild exploitation; this was reported responsibly to CERT Polska by researcher Kajetan Pawelec. Defenders using any of the listed KAMSOFT products should upgrade immediately to the patched versions to restore proper TLS certificate validation, particularly given the healthcare context and sensitivity of the data (authentication credentials and medical documents) that could be exposed.
Mentioned in this report
Source reporting: https://cert.pl/en/posts/2026/11/CVE-2026-113618
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