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TI-2026-85931 Aliases CVE-2026-113618GHSA-2fc4-jf8j-68hv

Improper server certificate validation in ZSIRep Client Library

Priority LOW 23CWE-295Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

The ZSIRep client library from KAMSOFT (ZSIREP.CLIENT.DLL) from 0.0 before 2.12.3.1 does not validate server certificates for HTTPS connections. It registers a process-wide .NET callback that accepts any certificate, and the callback stays active after the client is closed, weakening other HTTPS connections in the same application (CWE-295). A man-in-the-middle attacker on the network can impersonate the ZSIRep server and intercept or modify authentication data and documents.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

The ZSIRep client library (ZSIREP.CLIENT.DLL) is vulnerable to improper server certificate validation. It registers a process-wide .NET callback that accepts any certificate for HTTPS connections without verification. This allows a man-in-the-middle attacker to impersonate the ZSIRep server and intercept or modify authentication data and documents. The callback persists after the client is closed, weakening other HTTPS connections in the same application. The issue was fixed in version 2.12.3.1. The library is used in KS-SOMED (fixed in 2026.03.0.01), KS-PPS (fixed in 2026.03.1.0), KS-MEDIS (fixed in 2026.03.0.0), KS-SOLAB (fixed in 2026.3.1.0), and KS-ASW (fixed in 2026.3.0.1).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00125 2nd percentileScored 2026-11-07
Fix Fixed ZSIRep Client Library (KAMSOFT): 2.12.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KAMSOFTZSIRep Client Library0.0 to before 2.12.3.12.12.3.1Patch availableCNA
  • ZSIRep Client Library VendorKAMSOFT Affected 0.0 to before 2.12.3.1 Fixed in 2.12.3.1 Patch available CNA

Remediation

Update the ZSIRep Client Library to version 2.12.3.1. The library is used in KS-SOMED (fixed in 2026.03.0.01), KS-PPS (fixed in 2026.03.1.0), KS-MEDIS (fixed in 2026.03.0.0), KS-SOLAB (fixed in 2026.3.1.0), and KS-ASW (fixed in 2026.3.0.1), so update these products to the versions listed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA ZSIRep Client Library (KAMSOFT) Fixed in 2.12.3.1

Timeline

  1. 2026-11-06 Threatist record created from CVE-2026-113618
  2. 2026-11-06 Alias added: GHSA-2fc4-jf8j-68hv
  3. 2026-11-06 CISA SSVC decision points changed

References

Advisory 1

Other 1

  • TI-2026-30567 Hard-coded credentials in KS-SOMED CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences