CVE-2026-119409

high

Description

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.

References

https://www.vulncheck.com/advisories/opnsense-before-26.7.8-root-command-injection-via-firmware-mirror-setting

https://github.com/opnsense/update/commit/9bfd3b7020499b6032ee64804193a9f3ce8178fa

https://github.com/opnsense/update/blob/a2b8a10ba85f13b2cd002abb4c8692dde99f0261/src/update/opnsense-update.sh.in#L165

https://github.com/opnsense/core/security/advisories/GHSA-p683-f7x2-pm4p

https://github.com/opnsense/core/commit/8e214533d33c3af7481e86f616ee615adc6a0a73

https://github.com/opnsense/core/commit/1cc41fc39da99d59818c789b3b561f1515126f47

https://github.com/opnsense/core

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-113793

https://abraxaslabs.tech/research/opnsense-firmware-mirror-sed

Details

Source: Mitre, NVD

Published: 2026-10-30

Updated: 2026-10-30

Risk Information

CVSS v2

Base Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:M/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.2

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.6

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.02477