What is CVE-2026-55579?

CVE-2026-55579 is a critical-severity vulnerability in Pheditor, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2026-07-27.

How severe is CVE-2026-55579?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-55579 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Pheditor

CVE-2026-55579

Pheditor is a single-file editor and file manager written in PHP. From version 2.0.1 to before version 2.0.6, Pheditor ships with a hardcoded default password admin (SHA-512 hash stored at pheditor.php:11). There is no mechanism to force a password change on first login. Any deployment using the default credentials grants an attacker full access to the file editor, file upload, and terminal features, enabling arbitrary file read/write and remote code execution. This issue has been patched in version 2.0.6.

EPSS: 0.006 (46.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Pheditor — versions >= 2.0.1, < 2.0.6

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

Public proof-of-concept exploits

Ch4120N/CVE-2026-55579

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55579?: CVE-2026-55579 is a critical-severity vulnerability in Pheditor, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2026-07-27.
How severe is CVE-2026-55579?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-55579 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.