CVE-2026-53582
OPNsense is a FreeBSD based firewall and routing platform.
Impact
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.
Affected packages
This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.
Weakness classification
References
- NVD record
- CVE.org record
- 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
- http://seclists.org/fulldisclosure/2026/Jul/18