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.
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-monit-interface
Scores
CVSS v3
6.1
EPSS
0.0004
EPSS Percentile
10.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (1)
opnsense/opnsense
19.1
Published
Feb 15, 2026
Tracked Since
Feb 18, 2026