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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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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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