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.
Exploits (1)
References (4)
Core 4
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/46351
Various Sources product
https://opnsense.org
Various Sources patch
https://forum.opnsense.org/index.php?topic=11469.0
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-systemadvancedsysctlphp
Scores
CVSS v3
5.4
EPSS
0.0001
EPSS Percentile
1.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (1)
opnsense/opnsense
19.1
Published
Feb 15, 2026
Tracked Since
Feb 18, 2026