Gmission Web Fax Remote Code Inclusion via File Upload

Improper input validation, Unrestricted upload of file with dangerous type vulnerability in Gmission Web Fax allows Remote Code Inclusion. This issue affects Web Fax: from 3.0 before 3.1.

Casky was already ahead

This CVE exploits attack patterns that Casky's 419matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

Gmission Web Fax versions 3.0 through 3.0.x contain a critical vulnerability stemming from improper input validation and unrestricted file uploads. This flaw allows attackers to upload files with dangerous types, ultimately leading to remote code inclusion on affected systems. Organizations running Web Fax 3.0 are directly exposed, making this a high-priority patch for any entity relying on this faxing solution. The CVSS score of 8.4 reflects the severity: attackers can execute arbitrary code without authentication, compromising confidentiality, integrity, and availability of the system and potentially lateral movement within the network.

Casky's 419 mapped skills detect the attack patterns underlying this CVE by correlating multiple MITRE ATT&CK techniques: Initial Access (TA0001) via malicious file uploads, Defense Evasion (TA0043) through obfuscated or disguised payloads, and Execution (TA0002) when code runs server-side. Practitioners using Casky will observe findings highlighting insufficient file type validation checks, missing file extension whitelisting, and absence of content inspection before processing uploads. Claude's extended reasoning identifies the chain: an attacker uploads a file with a dangerous extension (e.g., .php, .jsp, .aspx) that the application fails to sanitize, then accesses it via a web path to trigger code execution. Security teams gain visibility into misconfigurations in upload handlers and can prioritize remediation against this exploitation pattern.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

419 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-9157.

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MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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Casky has 419 skills that investigate the attack patterns behind CVE-2026-9157. Run one and get CVSS-scored findings in 3 minutes.

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