Description
OPNsense 19.1 contains a stored cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.
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-stored-xss-via-systemadvancedsysctlphp
Scores
CVSS v3
6.4
EPSS
0.0004
EPSS Percentile
10.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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