Vulnerability · CVE-2019-25371
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation
Published Feb 15, 2026 · catalog updated Jun 17, 2026 · OPNsense 19.1 contains a
Last checked Nov 6, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2019-25371. EPSS is 0.29%. Act only if a listed version of OPNsense 19.1 contains a is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (OPNsense 19.1 contains a).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-45158 · Critical
- CVE-2026-44195 · Medium
- CVE-2026-44194 · Critical
- CVE-2026-44193 · Critical
- CVE-2026-34578 · High
- Severity
- Medium5.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.29%
- Remediation
- Vendor / distro source
- Affected products
- cpe opnsense/opnsense · vendor OPNsense OPNsense 19.1
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe opnsense/opnsense19.1
- vendor OPNsense OPNsense 19.119.1
How to fix CVE-2019-25371
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 19.1 · 1 other packages on the advisory
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2019-25371. EPSS is 0.29%. Act only if a listed version of OPNsense 19.1 contains a is installed.
Which versions are affected?
Compare what you have installed with OPNsense OPNsense 19.1 19.1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-79: Cross-site Scripting (XSS). EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 15, 2026 · EUVD
Detected
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
May 24, 2026 · EUVD
Updated
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
Jun 17, 2026 · Monitored products — high
Updated
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
Sources
- CVE.orgVulnerability recordCVE-2019-25371
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2019-25371
30-day exploitation probability 0.29%
first.org - EUVDVulnerability recordEUVD-2019-19424
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with
euvd.enisa.europa.eu - Monitored products — highVendor advisoryCVE-2019-25371
OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Monitored products — highNov 6, 2026
- EUVDNov 5, 2026
- FIRST EPSSNov 5, 2026
- CVE.orgNov 4, 2026