What is CVE-2026-53582?

CVE-2026-53582 is a high-severity vulnerability in Opnsense Core, classified under XML Injection (Blind XPath Injection). CVSS score: 7.1/10. Published 2026-10-15.

How severe is CVE-2026-53582?

High severity. CVSS v3 base score is 7.1 out of 10.

XPath Injection in Opnsense Core

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.

Published 2026-10-15.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Opnsense Core — versions < 26.1.10

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-53582?: CVE-2026-53582 is a high-severity vulnerability in Opnsense Core, classified under XML Injection (Blind XPath Injection). CVSS score: 7.1/10. Published 2026-10-15.
How severe is CVE-2026-53582?: High severity. CVSS v3 base score is 7.1 out of 10.