CVE-2026-35090: Authentication Bypass in Slican telephone exchanges
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-35090?
CVE-2026-35090 has a critical severity rating of 9.3.
How does CVE-2026-35090 allow an attacker to bypass authentication?
CVE-2026-35090 enables an unauthenticated attacker to connect remotely to the Slican telephone exchange's control panel via a specific caller ID.
Which devices are affected by CVE-2026-35090?
CVE-2026-35090 affects SLICAN IPL-256, SLICAN IPM-032, SLICAN CCT-1668, SLICAN MAC-6400, and SLICAN CXS-0424.
What are the potential consequences of exploiting CVE-2026-35090?
Exploiting CVE-2026-35090 allows attackers full access to service protocols and configuration panels, compromising the entire system.
How can organizations protect themselves from CVE-2026-35090?
Organizations should ensure that their Slican telephone exchange devices are updated and apply any security patches recommended by the vendor.