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Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted payloads through POST requests to diag_traceroute.php to execute arbitrary JavaScript in the context of a user's browser session.

PUBLISHED Reserved 2026-02-15 | Published 2026-02-15 | Updated 2026-02-17 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/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/...nse-reflected-xss-via-diagtraceroutephp (VulnCheck Advisory: OPNsense 19.1 Reflected XSS via diag_traceroute.php) third-party-advisory

cve.org (CVE-2019-25372)

nvd.nist.gov (CVE-2019-25372)

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