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.

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
opnsense core unaffected
Version Status Constraints
0 affected < 26.7.8
26.7.8 unaffected —

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No data.

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Project Subscriptions

Vendors Products
Opnsense Subscribe
Opnsense Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://abraxaslabs.tech/research/opnsense-firmware-mirror-sed cve-icon cve-icon
https://github.com/opnsense/core cve-icon cve-icon
https://github.com/opnsense/core/commit/1cc41fc39da99d59818c789b3b561f1515126f47 cve-icon cve-icon
https://github.com/opnsense/core/commit/8e214533d33c3af7481e86f616ee615adc6a0a73 cve-icon cve-icon
https://github.com/opnsense/core/security/advisories/GHSA-p683-f7x2-pm4p cve-icon cve-icon
https://github.com/opnsense/update/blob/a2b8a10ba85f13b2cd002abb4c8692dde99f0261/src/update/opnsense-update.sh.in#L165 cve-icon cve-icon
https://github.com/opnsense/update/commit/9bfd3b7020499b6032ee64804193a9f3ce8178fa cve-icon cve-icon
https://www.vulncheck.com/advisories/opnsense-before-26.7.8-root-command-injection-via-firmware-mirror-setting cve-icon cve-icon
History

Fri, 30 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title OPNsense before 26.7.8 Root Command Injection via Firmware Mirror Setting
First Time appeared Opnsense
Opnsense opnsense
Weaknesses CWE-78
CPEs cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
Vendors & Products Opnsense
Opnsense opnsense
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-30T11:30:46.595Z

Reserved: 2026-10-30T01:22:43.836Z

Link: CVE-2026-119409

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-30T12:16:37.510

Modified: 2026-10-30T12:16:37.510

Link: CVE-2026-119409

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T12:30:14Z

Weaknesses