CVE-2026-119409: Command Injection (CVSS 7.2)

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.

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CVSS v3.1 Score

7.2

HIGH

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

EPSS — Exploit Prediction

0.0248

Probability of exploitation

0.85%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

References

Other 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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.2 (HIGH).

How severe is CVE-2026-119409? +

CVE-2026-119409 has a CVSS v3.1 score of 7.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0248, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-119409? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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