Vulnerability in opnsense core

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund27 Oct 2026WID-SEC-2026-4201

  OPNsense: Vulnerability allows arbitrary code execution with administrator rights Translated from German

  CVE-2026-119409

[ References ]References

• abraxaslabs.tech/research/opnsense-firmware-mirror-sed
• github.com/opnsense/core
• github.com/opnsense/core/commit/1cc41fc39da99d59818c789b3b561f1515126f47
• github.com/opnsense/core/commit/8e214533d33c3af7481e86f616ee615adc6a0a73
• github.com/opnsense/core/security/advisories/GHSA-p683-f7x2-pm4p
• github.com/opnsense/update/blob/a2b8a10ba85f13b2cd002abb4c8692dde99f0261/src/update/opn…
• github.com/opnsense/update/commit/9bfd3b7020499b6032ee64804193a9f3ce8178fa
• www.vulncheck.com/advisories/opnsense-before-26.7.8-root-command-injection-via-firmware…