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Vulnerability record · CVE-2026-55578 · published 27 July 2026

CVE-2026-55578: OS command injection vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.67% · top 50.1% CWE-78 · OS command injection Deferred
8.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
28 Jul 2026Last modified by NVD

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.

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

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-55578), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.