CVE-2026-53582

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.

• CWE-91
• CWE-643

• https://github.com/opnsense/core/commit/e2cd067343511252fb0d391a17d82d3ecceece45
• https://github.com/opnsense/core/commit/fc2f0d745c17855d2027b192fd4e3fa913e26859
• https://github.com/opnsense/core/security/advisories/GHSA-xww7-76m6-mh2r
• https://seclists.org/fulldisclosure/2026/Jul/18

Published

Oct 15, 2026

Last Modified

Oct 16, 2026

Status

Deferred

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