CVE-2026-119409

EUVD-2026-113793
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.
OS Command Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.2 HIGH
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
opnsenseopnsense
𝑥
< 26.7.8
CNA
Common Weakness Enumeration
References
https://abraxaslabs.tech/research/opnsense-firmware-mirror-sed
https://github.com/opnsense/core
https://github.com/opnsense/core/commit/1cc41fc39da99d59818c789b3b561f1515126f47
https://github.com/opnsense/core/commit/8e214533d33c3af7481e86f616ee615adc6a0a73
https://github.com/opnsense/core/security/advisories/GHSA-p683-f7x2-pm4p
https://github.com/opnsense/update/blob/a2b8a10ba85f13b2cd002abb4c8692dde99f0261/src/update/opnsense-update.sh.in#L165
https://github.com/opnsense/update/commit/9bfd3b7020499b6032ee64804193a9f3ce8178fa
https://www.vulncheck.com/advisories/opnsense-before-26.7.8-root-command-injection-via-firmware-mirror-setting