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CVE-2019-25369

OPNsense 19.1 Stored XSS via system_advanced_sysctl.php

Published: Feb 15, 2026Updated: Feb 18, 2026 Sources: CVE List NVDCWE-79
NVD MITRE
6.4CVSSMEDIUM
EPSS Score
0.2%
Top 90.2%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

OPNsenseOpnsense
On-prem
Networking Infrastructure / firewall
opnsenseopnsense
On-prem
Networking Infrastructure / firewall
opnsenseoss-projectNetworking Infrastructure

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://www.exploit-db.com/exploits/46351
exploit-db.com
https://opnsense.org
opnsense.org
https://forum.opnsense.org/index.php?topic=11469.0
forum.opnsense.org
and 1 more references View all →

Timeline

Published
Feb 15, 2026
Last Updated
Feb 18, 2026

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