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PatchSiren cyber security CVE debrief

CVE-2026-18685 GL.iNet CVE debrief

A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. The function set_upgrade of the file /cgi-bin/glc of the component modem.so is impacted, leading to command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

Vendor
GL.iNet
Product
GL-MT3000
CVSS
HIGH 8.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-04
Original CVE updated
2026-10-23
Advisory published
2026-08-04
Advisory updated
2026-10-23

Who should care

Defenders responsible for GL.iNet GL-MT3000 devices, particularly those running firmware up to 4.4.5, should assess exposure and prioritize verification and potential upgrades or patches.

Why it matters

Defenders should prioritize verifying exposure of GL.iNet GL-MT3000 devices running firmware up to 4.4.5 and assess the need for upgrades or patches to prevent command injection attacks. The corpus does not establish versions beyond 4.4.5, exploitation, impact, or remediation, requiring verification from official sources.

  • Verify exposure of GL.iNet GL-MT3000 devices running firmware up to 4.4.5
  • Assess the need for upgrades or patches to prevent command injection
  • Monitor for potential remote attacks exploiting this vulnerability

Technical summary

The function set_upgrade of the file /cgi-bin/glc of the component modem.so in GL.iNet GL-MT3000 up to 4.4.5 is vulnerable to command injection, allowing remote attacks. Defenders should prioritize verifying exposure of GL.iNet GL-MT3000 devices running firmware up to 4.4.5 and assess the need for upgrades or patches to prevent command injection attacks. The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and weaknesses. However, the corpus does not establish versions beyond 4.4.5, exploitation, impact, or remediation, requiring verification from official sources.

Defensive priority

Defenders should prioritize verifying exposure of GL.iNet GL-MT3000 devices running firmware up to 4.4.5 and assess the need for upgrades or patches.

Recommended defensive actions

  • Verify exposure of GL.iNet GL-MT3000 devices running firmware up to 4.4.5
  • Assess the need for upgrades or patches
  • Monitor for potential remote attacks
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and weaknesses. However, the corpus does not establish versions beyond 4.4.5, exploitation, impact, or remediation, requiring verification from official sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-18685 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-18685

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-18685 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-18685

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.