Path Traversal in Mautic Campaign Import Enables Arbitrary File Write

A path traversal vulnerability exists in the campaign import feature of Mautic 7. When extracting uploaded ZIP files during campaign imports, a flaw in the validation logic allows file paths to escape the intended temporary directories. An authenticated user with campaign import privileges (campaign:imports:create) can write arbitrary PHP files to sensitive system directories. An attacker can exploit this to overwrite critical internal configuration or cache components, resulting in Remote Code Execution (RCE) under the context of the web server user.

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

CVE-2026-9559 is a critical path traversal vulnerability in Mautic 7's campaign import feature that allows authenticated users with campaign:imports:create privileges to write arbitrary PHP files to sensitive system directories. When the platform extracts uploaded ZIP files during campaign imports, insufficient path validation fails to contain extracted content within intended temporary directories, enabling directory traversal attacks. This vulnerability affects any organization running vulnerable Mautic instances where users have campaign import permissions, potentially including marketing teams, administrators, or delegated users. The 9.9 CVSS score reflects the severity: an authenticated attacker can overwrite critical configuration files, cache components, or inject malicious PHP code, leading to complete remote code execution and system compromise.

Casky.ai's 331 mapped skills detect the attack patterns underlying this vulnerability by analyzing behaviors aligned with MITRE ATT&CK's Initial Access (TA0001) and Discovery (TA0007) tactics. Practitioners using Casky would see findings highlighting suspicious file extraction patterns (CWE-22 path traversal indicators), unsafe deserialization or code evaluation logic (CWE-98), and improper neutralization of special elements (CWE-73). The platform's Claude-powered extended reasoning correlates multiple signals: legitimate campaign imports followed by unexpected file system writes outside designated directories, PHP file creation in configuration folders, and subsequent execution attempts. Security teams gain visibility into the attack chain—from exploitation through post-compromise behavior—enabling detection before remote code execution occurs and helping practitioners prioritize remediation of validation logic in archive extraction routines.

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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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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-2026-9559.

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

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