CVE-2026-55578

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

July 16, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 27, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
github Patch Available🟡 PoC Available

Incomplete command sanitization in terminal feature allows RCE via pipe operator, backtick substitution, and newline injection · Advisory · pheditor/pheditor · GitHub

https://github.com/pheditor/pheditor/security/advisories/GHSA-wg4w-wr5q-6vjc
github_release Patch Available

Pheditor 2.0.6

Patch available: pheditor/pheditor 2.0.6

https://github.com/pheditor/pheditor/releases/tag/2.0.6
github Patch Available🟡 PoC Available

Pheditor has an authenticated terminal command whitelist bypass · CVE-2026-54540 · GitHub Advisory Database · GitHub

https://github.com/advisories/GHSA-9643-6xjp-vx57

Vendor Advisories for CVE-2026-55578(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
pheditor/pheditor2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.52.0.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 01:30 UTCEPSS rescore
  2. 2026-07-28 15:47 UTCEG score recompute
  3. 2026-07-28 15:37 UTCEPSS rescore
  4. 2026-07-28 14:42 UTCEG score recompute
  5. 2026-07-27 18:24 UTCEG score recompute
  6. 2026-07-26 11:24 UTCEG score recompute
  7. 2026-07-23 03:20 UTCEG score recompute
  8. 2026-07-16 20:21 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55578?
CVE-2026-55578 is a high vulnerability published on July 16, 2026. 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 shellexec(). After the fix for GHSA-9643-6xjp-vx57 (which…
When was CVE-2026-55578 disclosed?
CVE-2026-55578 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55578 actively exploited?
CVE-2026-55578 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55578?
CVE-2026-55578 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55578?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55578, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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