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New CVE Detected

CVE-2026-64827 – Authentication Bypass – Telenia Software TVox 24.0.0–24.9.21 and 26.0.0–26.5.3

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Summary

CVE-2026-64827 is a critical authentication bypass vulnerability in Telenia Software TVox, a multichannel contact center and VoIP PBX platform. A flaw in the set_env.php authentication logic lets an unauthenticated, remote attacker reach protected administrative scripts, resulting in full compromise of confidentiality, integrity, and availability. The issue is rated critical.

Technical details

  • Root cause: The redirectToLoginAdminIRequestHaveAccessToken() function in set_env.php derives the current page name from $_SERVER['PHP_SELF'] and skips authentication when that value equals login_admin.php (the check if ($current_page != "login_admin.php")).
  • Trigger conditions: An attacker appends /login_admin.php to the path of any target PHP script. The application treats the request as targeting the login page and bypasses the authentication check.
  • Attack vector: Network; no authentication and no user interaction required.
  • Impact: Unauthenticated access to all scripts in the manager directory, leading to full unauthorized administrative access (classified as CWE-807, Reliance on Untrusted Inputs in a Security Decision).

Affected software

  • Telenia Software TVox 26.0.0 through 26.5.3
  • Telenia Software TVox 24.0.0 through 24.9.21

Severity

  • CVSS v3.1 base score: 9.8 (Critical) — vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 base score: 9.3 (Critical) — vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: At the time of disclosure no official patch had been released. Monitor Telenia Software for a security update and apply it as soon as it is published.
  • If no patch: Restrict network access to the manager path (/tvox/manager/html/) to authorized users only, using network-level access controls, until an official fix is available.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Server response header: TVox
  • Set-Cookie response header: TVOX
  • Page title: TVox Web Client
  • URL of a loaded script: a script src containing tvox and ending in .js

References

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1

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