CVE-2026-55579 pheditor CVE debrief

Who should care

Users of Pheditor versions 2.0.1 through 2.0.5 should be aware of this vulnerability and take immediate action to secure their installations. This includes updating to version 2.0.6 or later, changing all default passwords for Pheditor installations, and implementing additional security measures such as IP restrictions or two-factor authentication. Operators, administrators, and security teams responsible for Pheditor deployments should prioritize remediation and review compensating controls for exposed systems.

Technical summary

The vulnerability exists due to a hardcoded default password 'admin' in Pheditor versions 2.0.1 through 2.0.5. The password's SHA-512 hash is stored in the pheditor.php file at line 11. Without a mechanism for forced password change on first login, deployments using these default credentials are highly vulnerable. Successful exploitation allows attackers to access file editing, file upload, and terminal features, potentially leading to arbitrary file manipulation and remote code execution. The hardcoded default password poses a significant risk, and defenders should prioritize updating to version 2.0.6 or later.

Defensive priority

High

Recommended defensive actions

• Immediately update Pheditor to version 2.0.6 or later
• Change all default passwords for Pheditor installations
• Implement additional security measures such as IP restrictions or two-factor authentication
• Regularly review and update Pheditor installations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-27T18:16:56.880Z and was last modified on 2026-07-27T20:32:11.620Z. The NVD entry is currently Deferred. There is limited information available about the vulnerability beyond the CVE record and NVD entry. Defenders should verify the affected scope and severity with the vendor and review the official advisory for guidance on mitigation and remediation. The hardcoded default password 'admin' in Pheditor versions 2.0.1 through 2.0.5 poses a significant risk, and defenders should prioritize updating to version 2.0.6 or later. Additional security measures such as IP restrictions or two-factor authentication may be necessary to prevent exploitation.

Official resources