CVE-2026-35090 PUBLISHED

Authentication Bypass in Slican telephone exchanges

Assigner: CERT-PL
Reserved: 01.04.2026 Published: 27.05.2026 Updated: 27.05.2026

In Slican telephone exchanges it is possible to manage the control panel remotely. An unauthenticated attacker can connect to the modem via a telephone with a specific caller ID. This allows them to bypass admin authentication and gain full access to the service protocol and configuration panel. This vulnerability is independent of the telephone exchanges configuration. If remote access is disabled, calling with this caller ID will temporarily enable it.

This issue was fixed in versions below: - IPL-256: version 6.61.0040 - IPM-032: version 6.61.0040 - CCT-1668: version 6.56.0430 - MAC-6400: version 6.56.0430 - CXS-0424: version 6.30.0510

The issue STILL EXISTS in End-Of-Life telephone exchanges in versions 4.xx and below: - CCT-1668 (CCT1CPU) - MAC-6400 - CXS-0424 These products were discontinued in 2011 and 2012 and and will not receive updates. These products require a hardware update in order to receive a software update. The vendor recommends that users of these devices contact the their service department directly to determine the options for upgrading.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Product Status

Vendor Slican
Product CCT-1668
Versions Default: unaffected
  • affected from 0 to 6.56.0430 (excl.)
Vendor Slican
Product MAC-6400
Versions Default: unaffected
  • affected from 0 to 6.56.0430 (excl.)
Vendor Slican
Product CXS-0424
Versions Default: unaffected
  • affected from 0 to 6.30.0510 (excl.)
Vendor Slican
Product IPL-256
Versions Default: unaffected
  • affected from 0 to 6.61.0040 (excl.)
Vendor Slican
Product IPM-032
Versions Default: unaffected
  • affected from 0 to 6.61.0040 (excl.)

Credits

  • Grupa ŻN finder

References

Problem Types

  • CWE-288 Authentication Bypass Using an Alternate Path or Channel CWE