CVE-2026-55578 | Pheditor is a single-file editor and file manager written in… | CVSS 8.8 HIGH

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.

Metadata

CVE ID: CVE-2026-55578
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 23:18 UTC
Published: 2026-07-27 17:54 UTC
Last updated: 2026-07-28 14:03 UTC
Primary CWE: CWE-78
CWE-78: Improper Neutralization of Special Elements used in …
Vendor / Product: pheditor / pheditor
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
pheditor	pheditor	—	>= 2.0.1, < 2.0.6

Weakness (CWE)

CWE	Source	Description
CWE-78	cna	CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References (3)

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