CVE-2026-44666: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in zelon88 HRConvert2
CVE-2026-44666 is a critical OS command injection vulnerability in zelon88 HRConvert2 versions prior to 3. 3. 8. The sanitizeString() function in convertCore. php fails to remove backtick (`) and tab (\t) characters from user input, which is then passed to shell_exec(). This allows shell interpretation of these characters, enabling execution of arbitrary commands via crafted filenames. The vulnerability is fixed in version 3. 3. 8. No known exploits in the wild have been reported.
AI Analysis
Technical Summary
HRConvert2 is a self-hosted file conversion and sharing tool. In versions before 3.3.8, the sanitizeString() function inadequately filters special characters, specifically missing backtick and tab characters. User input containing these characters reaches the shell_exec() function, allowing an attacker to inject and execute arbitrary OS commands through manipulated filenames. This is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command. The issue is resolved in version 3.3.8.
Potential Impact
Successful exploitation allows unauthenticated attackers to execute arbitrary operating system commands on the server hosting HRConvert2. This can lead to full system compromise, data theft, or disruption of service. The CVSS 4.0 base score is 9.3, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade HRConvert2 to version 3.3.8 or later, where the sanitizeString() function properly filters all special characters including backtick and tab, preventing OS command injection. No other mitigation is indicated or required as the fix is available in the official release.
CVE-2026-44666: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in zelon88 HRConvert2
Description
CVE-2026-44666 is a critical OS command injection vulnerability in zelon88 HRConvert2 versions prior to 3. 3. 8. The sanitizeString() function in convertCore. php fails to remove backtick (`) and tab (\t) characters from user input, which is then passed to shell_exec(). This allows shell interpretation of these characters, enabling execution of arbitrary commands via crafted filenames. The vulnerability is fixed in version 3. 3. 8. No known exploits in the wild have been reported.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
HRConvert2 is a self-hosted file conversion and sharing tool. In versions before 3.3.8, the sanitizeString() function inadequately filters special characters, specifically missing backtick and tab characters. User input containing these characters reaches the shell_exec() function, allowing an attacker to inject and execute arbitrary OS commands through manipulated filenames. This is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command. The issue is resolved in version 3.3.8.
Potential Impact
Successful exploitation allows unauthenticated attackers to execute arbitrary operating system commands on the server hosting HRConvert2. This can lead to full system compromise, data theft, or disruption of service. The CVSS 4.0 base score is 9.3, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade HRConvert2 to version 3.3.8 or later, where the sanitizeString() function properly filters all special characters including backtick and tab, preventing OS command injection. No other mitigation is indicated or required as the fix is available in the official release.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-07T16:20:08.659Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0635daec166c07b010dd2f
Added to database: 5/14/2026, 8:51:38 PM
Last enriched: 5/14/2026, 9:06:50 PM
Last updated: 5/14/2026, 10:04:29 PM
Views: 4
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