CVE-2019-25372 — OPNsense 19

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_tracerout

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Opnsense	OPNsense	19.1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-02-15T13:58:54.354Z
• Last modified: 2026-03-05T01:26:19.614Z

09References

• www.exploit-db.com — https://www.exploit-db.com/exploits/46351
• opnsense.org — https://opnsense.org
• forum.opnsense.org — https://forum.opnsense.org/index.php?topic=11469.0
• www.vulncheck.com — https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-diagtracerouteph…