OPNsense up to 26.1.9 Trust module CAsField.php refid information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k2.46

Summaryinfo

A vulnerability categorized as problematic has been discovered in OPNsense up to 26.1.9. The impacted element is an unknown function of the file src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CAsField.php of the component Trust module. Such manipulation of the argument refid leads to information disclosure. This vulnerability is referenced as CVE-2026-53582. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OPNsense up to 26.1.9. Affected by this issue is an unknown functionality of the file src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CAsField.php of the component Trust module. The manipulation of the argument refid with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.10, the Trust module stores attacker-controlled certificate authority and certificate refid values and interpolates them into XPath expressions in src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CAsField.php and src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CertificatesField.php. A user with CA Manager or Certificate Manager privileges can submit a crafted refid and repeatedly retrieve the object to obtain a boolean refcount oracle, allowing values in config.xml to be recovered character by character. Exposed values can include password hashes, API credentials, certificate private keys, VPN key material, and high-availability credentials, enabling privilege escalation and compromise of other security domains. This issue is fixed in version 26.1.10.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-53582 since 06/09/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation requires an enhanced level of successful authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

By approaching the search of inurl:src/opnsense/mvc/app/models/OPNsense/Trust/FieldTypes/CAsField.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 26.1.10 eliminates this vulnerability.

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Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 2.7
VulDB Temp Score: 2.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OPNsense 26.1.10

Timelineinfo

06/09/2026 CVE reserved
10/15/2026 +128 days Advisory disclosed
10/15/2026 +0 days VulDB entry created
10/15/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-53582 (🔒)
GCVE (CVE): GCVE-0-2026-53582
GCVE (VulDB): GCVE-100-420680

Entryinfo

Created: 10/15/2026 17:33
Changes: 10/15/2026 17:33 (65)
Complete: 🔍
Cache ID: 216::103

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