XSS in Opnsense
CVE-2019-25373
OPNsense 19.1 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts by submitting crafted input to the category parameter. Attackers can send POST requests to firewall_rules_edit.php with script payloads in the category field to execute arbitrary JavaScript in the browsers of other users accessing firewall rule pages.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (10.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Opnsense — versions 19.1
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, VDB Entry, Third Party Advisory, exploit)
- disclosure@vulncheck.com (Product, product)
- disclosure@vulncheck.com (Release Notes, patch)
- disclosure@vulncheck.com (Broken Link, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25373?
- CVE-2019-25373 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-15.
- How severe is CVE-2019-25373?
- Medium severity. CVSS v3 base score is 6.4 out of 10.