CVE-2026-55578: 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 blocklis

highCVSS 8.8CVE-2026-55578

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.8
Published: 2026-07-27
Last updated: 2026-07-28
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55578

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-555780.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55578	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highGHSA-wg4w-wr5q-6vjc: Pheditor: Incomplete command sanitization in terminal feature allows RCE via pipe operato…ghsa

Recent advisories for Pheditor is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-55579: Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before…nvd · 2026-07-27
highCVE-2026-54540: Pheditor is a single-file editor and file manager written in PHP. Prior to version 2.0.5, ther…nvd · 2026-07-27
criticalCVE-2026-48030: Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before…nvd · 2026-07-27
criticalGHSA-f25v-x6vr-962g: Pheditor: Authentication Bypass in Forced Password-Change Flow via Unverified Current Pas…ghsa · 2026-07-24
highGHSA-g3hq-hphg-8fhh: Pheditor: Terminal command-allowlist bypass via argument injection leads to RCE — survivi…ghsa · 2026-07-24
criticalGHSA-p4h7-p9rj-2pq2: Pheditor: Hardcoded default password 'admin' with no forced change enables full applicati…ghsa · 2026-07-16