CVE-2026-58394Medium· 5.2▾ TwilightPoC available

OPNsense is a FreeBSD based firewall and routing platform

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 28.6 · likelihood 0 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 15, 2026

Updated

Oct 15, 2026

CVSS

5.2

Vendor

opnsense

Product

core

CWE

CWE-79

Depth score

41 · Moderate

EPSS

0.24% · p15

Platforms

—

Source

NVD

Vector

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

CISA SSVC

decided 2026-10-15

Exploitation: poc
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 16.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 1 day

Oct 15, 2026Published
Disclosed via NVD
Oct 15, 2026Public exploit observed
Exploit / PoC code exists
Oct 16, 2026EPSS first tracked
0.2%

opnsense CWE-79 #nvd #cve.org #exploit-available

Affected

core < 26.1.11

Full technical detail▾

Overview

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, src/www/system_advanced_admin.php reads certificate records into $a_cert but omits that array from legacy_html_escape_form_data() before rendering each certificate descr value in the SSL Certificate selector. The certificate description accepts HTML metacharacters, allowing a user with the page-system-certmanager privilege to store markup that executes when another user opens System Settings Administration. This issue is fixed in version 26.1.11.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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CVE-2026-58394Medium· 5.2▾ TwilightPoC available

OPNsense is a FreeBSD based firewall and routing platform

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 28.6 · likelihood 0 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 15, 2026

Updated

Oct 15, 2026

CVSS

5.2

Vendor

opnsense

Product

core

CWE

CWE-79

Depth score

41 · Moderate

EPSS

0.24% · p15

Platforms

—

Source

NVD

Vector

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

CISA SSVC

decided 2026-10-15

Exploitation: poc
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 16.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 1 day

Oct 15, 2026Published
Disclosed via NVD
Oct 15, 2026Public exploit observed
Exploit / PoC code exists
Oct 16, 2026EPSS first tracked
0.2%

opnsense CWE-79 #nvd #cve.org #exploit-available

Affected

core < 26.1.11

Full technical detail▾

Overview

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Change history

Field changes observed since this record was first indexed.

Oct 15, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available