Pheditor up to 2.0.5 Terminal Feature shell_exec os command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Pheditor up to 2.0.5. This impacts the function shell_exec of the component Terminal Feature. Executing a manipulation can lead to os command injection. The identification of this vulnerability is CVE-2026-55578. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Pheditor up to 2.0.5. It has been declared as critical. This vulnerability affects the function shell_exec of the component Terminal Feature. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before version 2.0.6, the terminal feature in Pheditor uses an incomplete character blocklist to sanitize user-supplied commands before passing them to shell_exec(). After the fix for GHSA-9643-6xjp-vx57 (which added $ to the blocklist), the characters | (single pipe), ` (backtick), and the newline byte (0x0A) remain unblocked. An authenticated user with the terminal permission (enabled by default) can leverage any of these to bypass the TERMINAL_COMMANDS allowlist and execute arbitrary OS commands as the web server user. This issue has been patched in version 2.0.6.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-55578 since 06/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 2.0.6 eliminates this vulnerability.

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Productinfo

Name

• Pheditor

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5

Website

• Product: https://github.com/pheditor/pheditor/

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CPE 2.2info

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