Path Traversal in HSC MailInspector File Access Endpoint

HSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input in the /tap/dw.php endpoint. The text parameter is used to construct file paths without adequate normalization or restriction to a safe base directory. A remote attacker can exploit this flaw to access arbitrary files on the underlying operating system, resulting in unauthorized disclosure of sensitive information.

Casky was already ahead

This CVE exploits attack patterns that Casky's 331matched 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

HSC MailInspector 5.3.3-7 contains a path traversal vulnerability in the /tap/dw.php endpoint where the 'text' parameter fails to properly validate or normalize user input before constructing file paths. This allows remote attackers to traverse directory structures using sequences like '../' to access arbitrary files outside intended directories, leading to unauthorized disclosure of sensitive information such as configuration files, credentials, or system data. Organizations deploying this mail inspection appliance face direct exposure to information disclosure attacks without authentication barriers, making this a critical concern for email security infrastructure.

Casky's 754 mapped security skills leverage Claude AI with extended reasoning to detect the adversarial techniques underlying this vulnerability across two MITRE ATT&CK tactics: TA0001 (Reconnaissance) and TA0007 (Discovery). Practitioners using Casky will identify attack patterns including reconnaissance activity when attackers probe the /tap/dw.php endpoint with path traversal payloads, and discovery techniques as adversaries enumerate file system structures to locate sensitive files. The 331 matching skills enable detection of malicious 'text' parameter variations containing directory traversal sequences, abnormal file access patterns from the web service process, and unauthorized attempts to read system files—surfacing these suspicious behaviors in security findings before attackers successfully exfiltrate sensitive data.

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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 →

331 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-29963.

analyzing-cloud-storage-access-patterns

cloud security · low

Run

analyzing-ios-app-security-with-objection

mobile security · low

Run

analyzing-malicious-url-with-urlscan

phishing defense · medium

Run

MITRE ATT&CK Techniques

TA0001 TA0007

Investigate the attack patterns behind CVE-2026-29963

Casky has 331 skills that investigate the attack patterns behind CVE-2026-29963. Run one and get CVSS-scored findings in 3 minutes.

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