CVE-2026-35089 Use of Weak Credentials in Slican telephone exchanges
An unauthenticated attacker can deduce the secure key to obtain admin credentials on Slican telephone exchanges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35089?
CVE-2026-35089 is a high-severity vulnerability in Slican CCT-1668, published on 27 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Slican telephone exchanges secure key is generated in a predictable manner using properties of the telephone exchange which can be obtained without authentication. An unauthenticated attacker can deduce the secure key and obtain admin credentials.
This issue was fixed in versions below: - IPx series: 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.
Weakness: CWE-1391
Which versions are affected by CVE-2026-35089?
How do I fix CVE-2026-35089?
No fix has been published for CVE-2026-35089 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-35089 being exploited?
There is no known exploitation of CVE-2026-35089 in the wild and no public exploit code.
Sources
Also known as GHSA-pch2-h8hc-84fh.