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CVE-2026-35089— Use of Weak Credentials in Slican telephone exchanges

Quick assessment

Affected
Slican IPx
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 IPx等都是波兰Slican公司的产品。Slican IPx是一系列企业通信与IP电话交换系统。Slican CCT是一系列企业通信与IP电话交换系统。Slican MAC是一系列企业级电话交换与统一通信系统。 Slican多款产品存在安全漏洞，该漏洞源于安全密钥以可预测方式生成，未认证攻击者可推断安全密钥并获取管理员凭据。以下产品及版本受到影响：IPx系列6.61.0040之前版本、CCT-1668 6.56.0430之前版本、MAC-6400 6.56.0430之前版本和CXS-0424

AI Predicted 9.8 Difficulty: Easy EPSS 0.56% · P45

Affected Version Matrix 4

VendorProduct Version RangeStatus
Slican CCT-1668 < 6.56.0430 affected
Slican CXS-0424 < 6.30.0510 affected
Slican IPx < 6.61.0040 affected
Slican MAC-6400 < 6.56.0430 affected
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I. Basic Information for CVE-2026-35089

Vulnerability Information
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Vulnerability Title
Use of Weak Credentials in Slican telephone exchanges
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1391
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 IPx等都是波兰Slican公司的产品。Slican IPx是一系列企业通信与IP电话交换系统。Slican CCT是一系列企业通信与IP电话交换系统。Slican MAC是一系列企业级电话交换与统一通信系统。 Slican多款产品存在安全漏洞，该漏洞源于安全密钥以可预测方式生成，未认证攻击者可推断安全密钥并获取管理员凭据。以下产品及版本受到影响：IPx系列6.61.0040之前版本、CCT-1668 6.56.0430之前版本、MAC-6400 6.56.0430之前版本和CXS-0424
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 IPx 0 ~ 6.61.0040 -
Slican CCT-1668 0 ~ 6.56.0430 -
Slican MAC-6400 0 ~ 6.56.0430 -
Slican CXS-0424 0 ~ 6.30.0510 -

II. Public POCs for CVE-2026-35089

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III. Intelligence Information for CVE-2026-35089

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Security Blog Posts for CVE-2026-35089 (1)

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

CVE-2026-35087 Authentication Bypass in Slican telephone exchanges
CVE-2026-35090 Authentication Bypass in Slican telephone exchanges

IV. Related Vulnerabilities

Same product: IPx
Same vendor: Slican
Same weakness: CWE-1391

V. Comments for CVE-2026-35089

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