CVE-2026-35090 (GCVE-0-2026-35090)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:42 – Updated: 2026-05-27 12:42
VLAI
Title
Authentication Bypass in Slican telephone exchanges
Summary
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.
Severity
9.3 (Critical)
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
CWE
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
URL Tags
https://cert.pl/posts/2026/05/CVE-2026-35087 third-party-advisory
Impacted products
Vendor Product Version
Slican CCT-1668 Affected: 0 , < 6.56.0430 (semver)
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Slican MAC-6400 Affected: 0 , < 6.56.0430 (semver)
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Slican CXS-0424 Affected: 0 , < 6.30.0510 (semver)
Create a notification for this product.
Slican IPL-256 Affected: 0 , < 6.61.0040 (semver)
Create a notification for this product.
Slican IPM-032 Affected: 0 , < 6.61.0040 (semver)
Create a notification for this product.
Date Public
2026-05-27 12:42
Credits
Grupa ŻN
Show details on NVD website
To clipboard 

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      "credits": [
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          "value": "Grupa \u017bN"
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      "datePublic": "2026-05-27T12:42:00.000Z",
      "descriptions": [
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              "value": "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.\u0026nbsp;This allows them to bypass admin authentication and\u0026nbsp;gain full access to the service protocol and configuration panel. This vulnerability is independent of the telephone exchanges configuration.\u0026nbsp;If remote access is disabled, calling with this caller ID will temporarily enable it.\u003cbr\u003e\u003cbr\u003eThis issue was fixed in versions below:\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- IPL-256: version 6.61.0040\u003cbr\u003e- IPM-032: version 6.61.0040\u003c/span\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- CCT-1668: version 6.56.0430\u003c/span\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- MAC-6400: version 6.56.0430\u003c/span\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- CXS-0424: version 6.30.0510\u003c/span\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u003cbr\u003e\u003c/span\u003eThe issue STILL EXISTS in End-Of-Life telephone exchanges in versions 4.xx and below:\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- CCT-1668 (\u003cspan style=\"background-color: rgba(221, 223, 228, 0.1);\"\u003eCCT1CPU)\u003c/span\u003e\u003c/span\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e- MAC-6400\u003cbr\u003e\u003c/span\u003e- \u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eCXS-0424\u003cbr\u003e\u003c/span\u003eThese 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."
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            "Recovery": "NOT_DEFINED",
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            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
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          "url": "https://cert.pl/posts/2026/05/CVE-2026-35087"
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      "source": {
        "discovery": "EXTERNAL"
      },
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    "datePublished": "2026-05-27T12:42:47.318Z",
    "dateReserved": "2026-04-01T11:23:16.118Z",
    "dateUpdated": "2026-05-27T12:42:47.318Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.