What’s Vulnerable › Vulnerabilities

CVE-2026-55578: Pheditor: Incomplete command sanitization in terminal feature allows RCE via pipe operator, backtick substitution, and newline injection

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-07-28
• Weakness: CWE-78

Description

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.

Affected products

• pheditor: from 2.0.1, < 2.0.6

References

• https://github.com/advisories/GHSA-9643-6xjp-vx57
• https://github.com/pheditor/pheditor/releases/tag/2.0.6
• https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc
• https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc

Get alerted when CVE-2026-55578 or the next vulnerability affects your stack