Vulnerability · Published Jul 27, 2026 · Assigned by GitHub_M

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

High 8.8

In plain English

A high-severity OS command injection in pheditor from pheditor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 47.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	pheditor/pheditor	2.0.6	GHSA-wg4w-wr5q-6vjc

Affected products (as reported)

Vendor	Product	Versions
pheditor	pheditor	>= 2.0.1, < 2.0.6

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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