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TI-2026-82992 Aliases CVE-2026-119409GHSA-q3x8-9859-gj9r

Command injection in OPNsense firmware mirror setting allows root access

Priority MEDIUM 44CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

OPNsense before 26.7.8 contains a command injection flaw in its firmware mirror setting, tracked as CWE-78. Shell metacharacters stored in a malicious firmware mirror URL are evaluated as commands with root privileges. An authenticated user with the System: Firmware privilege can exploit this through the firmware set API, and can also disable package signature verification through sed injection.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02477 84th percentileScored 2026-11-07
Fix Fixed core (opnsense): 26.7.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
opnsensecorebefore 26.7.826.7.8Patch availableCNA
  • core Vendoropnsense Affected before 26.7.8 Fixed in 26.7.8 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*——opnsense
  • cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:* Versions — — ·opnsense

Remediation

The core package is fixed in OPNsense 26.7.8.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA core (opnsense) Fixed in 26.7.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    opnsense core 26.7.8

    3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW

    Other records, highest priority first

    • TI-2026-83002 Log injection in OPNsense lets attackers lock out victim IP addressesPriority LOW 37
    • TI-2026-83003 Configuration line injection in OPNsense wireless WPA settingsPriority LOW 30
    Show all 3 records →

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-119409
  2. 2026-10-30 Alias added: GHSA-q3x8-9859-gj9r
  3. 2026-10-30 CISA SSVC decision points changed
  4. 2026-10-30 Priority changed: MEDIUM → LOW
  5. 2026-11-01 Priority changed: LOW → MEDIUM

References

Patch 3

Advisory 2

Other 2

  • TI-2023-20247 A command injection vulnerability in the component /api/cron/settings/setJob/ of OPNsense… CVSS 3.1CRITICAL 9.8
  • TI-2023-20243 Insecure permissions in the configuration directory (/conf/) of OPNsense Community… CVSS 3.1CRITICAL 9.8
  • TI-2023-20240 A command injection vulnerability in the component diag_backup.php of OPNsense Community… CVSS 3.1CRITICAL 9.8
  • TI-2023-11947 DECISO OPNsense 23.1 does not impose rate limits for authentication, allowing attackers… CVSS 3.1CRITICAL 9.8
  • TI-2026-74819 Path traversal in OPNsense GeoIP importer allows root code execution CVSS 3.1CRITICAL 9.9
  • TI-2023-20246 /ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and… CVSS 3.1CRITICAL 9.6
See all 54 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences