CVE-2019-25375

5.1 mediumEPSS 0.4%

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.

Severity

CVSS 4.0

5.1 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-02-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

opnsense:opnsense

References

https://forum.opnsense.org/index.php?topic=11469.0
https://opnsense.org
https://www.exploit-db.com/exploits/46351
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-monit-interface

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