Path Traversal in OpenEMR Billing Report Generation

OpenEMR before 8.3.0 contains a path traversal vulnerability in interface/billing/sl_eob_process.php that allows authenticated users to write and read files by supplying unsanitized eraname values. Attackers without billing privileges can inject ../ sequences to create ERA report .html files anywhere the web user can write and parse arbitrary .edi files echoed into the report.

Casky was already ahead

This CVE exploits attack patterns that Casky's 351matched 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

OpenEMR, a widely-deployed open-source electronic health record system, contains a critical path traversal vulnerability in its billing module that permits authenticated users to read and write files outside intended directories. By manipulating the eraname parameter in the sl_eob_process.php file with directory traversal sequences (../ notation), attackers can bypass file access restrictions and create malicious HTML files or parse arbitrary EDI files in unintended locations. This vulnerability is particularly concerning because it affects the billing interface—a core financial function in healthcare organizations—and requires only basic authentication, meaning users without elevated billing privileges can still exploit it to compromise system integrity and potentially access sensitive financial or patient data.

Casky.ai maps this vulnerability across 351 security skills aligned with MITRE ATT&CK, enabling practitioners to detect exploitation attempts through two primary attack vectors: TA0001 (Initial Access) and TA0007 (Discovery). Practitioners using Casky's extended reasoning would identify suspicious patterns such as: abnormal path traversal sequences in HTTP requests to the billing interface, unusual file write operations originating from authenticated billing sessions, attempts to access parent directories (../) in parameters, and unexpected HTML or EDI file creation outside designated directories. The platform's Claude-powered analysis would flag deviations from normal billing workflows—such as eraname values containing path separators or excessive dot-slash combinations—and correlate these indicators with known exploitation patterns, allowing security teams to detect both active attacks and post-exploitation file artifacts before they impact clinical operations or financial records.

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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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351 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-124457.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0007

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