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CVE-2026-35090— Authentication Bypass in Slican telephone exchanges

Quick assessment

Affected
Slican CCT-1668
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Slican IPL等都是波兰Slican公司的产品。Slican IPL是一个互联网协议私有分支交换机。Slican IPM是一个IP电话交换机服务器。Slican CCT是一系列企业通信与IP电话交换系统。 Slican多款产品存在安全漏洞，该漏洞源于可通过特定主叫号码远程管理控制面板，未认证攻击者可绕过管理员身份验证并完全访问服务协议和配置面板。以下产品及版本受到影响：IPL-256 6.61.0040之前版本、IPM-032 6.61.0040之前版本、CCT-1668 6.56.0430之前版本

AI Predicted 9.8 Difficulty: Trivial EPSS 0.62% · P47

Affected Version Matrix 5

VendorProduct Version RangeStatus
Slican CCT-1668 < 6.56.0430 affected
Slican CXS-0424 < 6.30.0510 affected
Slican IPL-256 < 6.61.0040 affected
Slican IPM-032 < 6.61.0040 affected
Slican MAC-6400 < 6.56.0430 affected
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I. Basic Information for CVE-2026-35090

Vulnerability Information
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Vulnerability Title
Authentication Bypass in Slican telephone exchanges
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Slican多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Slican IPL等都是波兰Slican公司的产品。Slican IPL是一个互联网协议私有分支交换机。Slican IPM是一个IP电话交换机服务器。Slican CCT是一系列企业通信与IP电话交换系统。 Slican多款产品存在安全漏洞，该漏洞源于可通过特定主叫号码远程管理控制面板，未认证攻击者可绕过管理员身份验证并完全访问服务协议和配置面板。以下产品及版本受到影响：IPL-256 6.61.0040之前版本、IPM-032 6.61.0040之前版本、CCT-1668 6.56.0430之前版本
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Slican CCT-1668 0 ~ 6.56.0430 -
Slican MAC-6400 0 ~ 6.56.0430 -
Slican CXS-0424 0 ~ 6.30.0510 -
Slican IPL-256 0 ~ 6.61.0040 -
Slican IPM-032 0 ~ 6.61.0040 -

II. Public POCs for CVE-2026-35090

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III. Intelligence Information for CVE-2026-35090

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Security Blog Posts for CVE-2026-35090 (1)

Same Patch Batch · Slican · 2026-05-27 · 3 CVEs total

CVE-2026-35087 Authentication Bypass in Slican telephone exchanges
CVE-2026-35089 Use of Weak Credentials in Slican telephone exchanges

IV. Related Vulnerabilities

Same vendor: Slican
Same weakness: CWE-288

V. Comments for CVE-2026-35090

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