Medium severity · published Feb 15, 2026
CVE-2019-25377
OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php
6.1
CVSS
0.3%
EPSS
No
On KEV
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.
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)0.3% · higher than 20% 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-2019-25377
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-25377
Release Notes
https://forum.opnsense.org/index.php?topic=11469.0
Product
https://opnsense.org
Exploit
https://www.exploit-db.com/exploits/46351
Broken Link
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-systemadvancedsysctlphp
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