Authenticated browser script execution via unencoded form actions
Published Jul 1, 2026 · Updated Jul 1, 2026
Reflected XSS in The Guardian Language System through commit e42c395 allows remote authenticated users to run script via a crafted URL. The text_file.php page concatenates the id GET parameter without HTML attribute encoding into six form action attributes, allowing a quote to terminate the attribute and inject a script element. Guest-level authentication and a victim opening the crafted URL are required; the script runs in the victim's browser session and can read or alter page-accessible data.
Summary
What happened
Reflected XSS in The Guardian Language System through commit e42c395 allows remote authenticated users to run script via a crafted URL. The text_file.php page concatenates the id GET parameter without HTML attribute encoding into six form action attributes, allowing a quote to terminate the attribute and inject a script element. Guest-level authentication and a victim opening the crafted URL are required; the script runs in the victim's browser session and can read or alter page-accessible data.
The record
- CVE
- CVE-2026-34097
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- The Guardian
- Product
- Language System
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 1, 2026CVE publishedPublication date reported by the CVE source.
- Jul 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=e42c395ec4b03fe62973a669c9209a673838b8a4
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- the_guardian_system_pocproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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