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Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject malicious scripts via the value parameter. Attackers can craft POST requests with script payloads in the value parameter to execute JavaScript in the context of authenticated user sessions.

PUBLISHED Reserved 2026-02-15 | Published 2026-02-15 | Updated 2026-02-15 | Assigner VulnCheck




MEDIUM: 4.8CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

19.1
affected

Credits

Ozer Goker finder

References

www.exploit-db.com/exploits/46351 (ExploitDB-46351) exploit

opnsense.org (OPNsense Official Website) product

forum.opnsense.org/index.php?topic=11469.0 (OPNsense 19.1.1 Release Announcement) patch

www.vulncheck.com/...flected-xss-via-systemadvancedsysctlphp (VulnCheck Advisory: OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php) third-party-advisory

cve.org (CVE-2019-25377)

nvd.nist.gov (CVE-2019-25377)

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