What’s Vulnerable › Vulnerabilities

CVE-2019-25369: OPNsense 19.1 Stored XSS via system_advanced_sysctl.php

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-15 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• OPNsense: 19.1

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-stored-xss-via-systemadvancedsysctlphp

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