RCE in Opnsense Core
CVE-2026-119409
OPNsense before 26.7.8 contains a command injection vulnerability that allows authenticated users with the System: Firmware privilege to execute commands as root by storing a malicious firmware mirror URL. Attackers can submit shell metacharacters through POST /api/core/firmware/set that opnsense-update evaluates with eval, and can also disable package signature verification through sed injection.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
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
Weakness classification (CWE)
References
- github.com/opnsense/core/security/advisories/GHSA-p683-f7x2-pm4p (vendor-advisory)
- github.com/opnsense/core/commit/1cc41fc39da99d59818c789b3b561f1515126f47 (patch)
- github.com/opnsense/core/commit/8e214533d33c3af7481e86f616ee615adc6a0a73 (patch)
- github.com/opnsense/update/commit/9bfd3b7020499b6032ee64804193a9f3ce8178fa (patch)
- github.com/opnsense/update/blob/a2b8a10ba85f13b2cd002abb4c8692dde99f0261/src/up… (technical-description)
- abraxaslabs.tech/research/opnsense-firmware-mirror-sed (third-party-advisory)
- github.com/opnsense/core (product)
- www.vulncheck.com/advisories/opnsense-before-26.7.8-root-command-injection-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119409?
- CVE-2026-119409 is a high-severity vulnerability in Opnsense Core, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-10-30.
- How severe is CVE-2026-119409?
- High severity. CVSS v3 base score is 7.2 out of 10.