Medium severity · published Feb 15, 2026
CVE-2019-25375
OPNsense 19.1 Reflected XSS via monit interface
6.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OPNsense · Opnsense
19.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-25375
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-25375
Release Notes
https://forum.opnsense.org/index.php?topic=11469.0
Product
https://opnsense.org
Exploit
https://www.exploit-db.com/exploits/46351
Third Party Advisory
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-monit-interface
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