CVE-2019-25375

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.

CVSS v4.0

5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

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

EPSS

0.36% chance of exploitation in the next 30 days, 29th percentile

Published

2026-02-15

Updated

2026-05-24

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/46351

References

• CVE Record
• NVD entry

Related

• CVE-2019-25374
• CVE-2019-25376
• CVE-2019-25373
• CVE-2019-25377
• CVE-2019-25372
• CVE-2019-25378