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Telenia TVox CVE-2026-64827

| EUVDEUVD-2026-52292 CRITICAL
Reliance on Untrusted Inputs in a Security Decision (CWE-807)
2026-08-03 VulnCheck GHSA-9v39-f83v-66p8
PHP Authentication Bypass Tvox
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Remote, deterministic path-suffix bypass needs no auth or interaction (AV:N/AC:L/PR:N/UI:N); unauthenticated access to all manager scripts yields high C/I/A with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 03, 2026 - 14:29 vuln.today
CVE Published
Aug 03, 2026 - 13:26 cve.org
CRITICAL 9.3

DescriptionCVE.org

Telenia Software TVox 26.5.3 and prior 26.x versions, and 24.9.21 and prior 24.x versions, contain an authentication bypass vulnerability in set_env.php where the redirectToLoginAdminIRequestHaveAccessToken() function derives the current page name from PHP_SELF and skips authentication when the value matches 'login_admin.php'. Attackers can append '/login_admin.php' to the path of any target PHP script to cause the authentication check to pass and gain unauthenticated access to all PHP scripts under the manager HTML directory.

Articles & Coverage 1

News Critical Authentication Bypass in Telenia Software TVox - CVE-2026-64827 Aug 03, 2026

AnalysisAI

Authentication bypass in Telenia Software TVox (versions 24.x ≤24.9.21 and 26.x ≤26.5.3) lets remote unauthenticated attackers reach every PHP script under the manager HTML directory by appending '/login_admin.php' to any target script's path. The flaw stems from set_env.php trusting the client-controllable PHP_SELF value when deciding whether to skip authentication. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate internet-facing TVox manager interface
Delivery
Append '/login_admin.php' to target PHP path
Exploit
PHP_SELF check skips authentication
Execution
Target admin script executes unauthenticated
Persist
Read/modify manager configuration
Impact
Compromise TVox management functions
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Vulnerability AssessmentAI

Exploitation The concrete prerequisite is network reachability to the TVox web 'manager' interface and a target PHP script located under the manager HTML directory; the attacker then appends '/login_admin.php' to that script's path so PHP_SELF resolves to 'login_admin.php' and redirectToLoginAdminIRequestHaveAccessToken() skips authentication. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All signals point to a genuine high priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker with no credentials sends an HTTP request to a sensitive manager script but appends '/login_admin.php' to the URL path (e.g. /manager/somescript.php/login_admin.php), causing the PHP_SELF-based auth check to be skipped and the target script to run unauthenticated. …
Remediation Upgrade to a TVox release newer than the affected ceilings - beyond 24.9.21 on the 24.x line and beyond 26.5.3 on the 26.x line; the input does not name an exact fixed build, so treat this as 'Patch available per vendor advisory' and confirm the precise fixed version directly with Telenia (https://www.teleniasoftware.com/) and the advisories at https://karmainsecurity.com/KIS-2026-14 and https://www.vulncheck.com/advisories/telenia-tvox-authentication-bypass-via-set-env-php. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: identify all TVox deployments (versions 24.x ≤24.9.21 and 26.x ≤26.5.3) in your environment, document access levels and network exposure, and isolate critical instances from untrusted networks if feasible. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-64827 vulnerability details – vuln.today
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