XSS in Guardian Language-System
CVE-2026-34098
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Guardian Language-System — versions 0
Weakness classification (CWE)
References
- gist.github.com/cyberinforepo/d5b2771d82e1b31b8fc1c33052e08dad (technical-description, exploit)
- www.vulncheck.com/advisories/guardian-language-system-xss-via-id-parameter-in-m… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-34098?
- CVE-2026-34098 is a medium-severity vulnerability in Guardian Language-System, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2026-07-01.
- How severe is CVE-2026-34098?
- Medium severity. CVSS v3 base score is 4.6 out of 10.