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5.1
OPNsense: Unauthenticated Attackers Can Inject Malicious Scripts via Mailserver Input
CVE-2019-25375
Summary
OPNsense 19.1 has a security flaw that lets attackers inject malicious code into users' browsers without needing a password. This can happen when an attacker sends a specific type of request to the system's monitoring interface. To fix this, update your OPNsense system to the latest version.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| opnsense | opnsense | 19.1 | – |
Original title
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Atta...
Original description
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.
nvd CVSS3.1
6.1
nvd CVSS4.0
5.1
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
- https://forum.opnsense.org/index.php?topic=11469.0 Release Notes
- https://opnsense.org Product
- https://www.exploit-db.com/exploits/46351 Exploit Third Party Advisory VDB Entry
- https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-monit-interface Third Party Advisory
Published: 15 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026