CVE-2026-54416 pluck-cms CVE debrief

Who should care

Administrators and users of Pluck CMS 4.7.21, as well as security teams monitoring for potential remote code execution attacks, should be aware of this vulnerability and take immediate action to mitigate the risk. Security teams should review and apply vendor patches, restrict file uploads, and monitor for suspicious activity. Additionally, operators and platform administrators should verify their deployments and ensure proper mitigations are in place.

Technical summary

CVE-2026-54416 is a HIGH severity vulnerability in Pluck CMS 4.7.21. The vulnerability allows an authenticated administrator to upload a file with a '.php8' extension, which can be executed as PHP code on servers running PHP 8.x, leading to remote code execution. The vulnerability exists due to a blacklist in data/inc/files.php that omits the '.php8' extension. Affected product deployments should be reviewed for potential exposure, and administrators should verify their deployments to ensure proper mitigations are in place. Limited source details are available; defensive verification and review of official advisories are recommended. The CVE record was published on 2026-08-05T08:16:33.637Z and has not been modified since then. Administrators and users of Pluck CMS 4.7.21 should be aware of this vulnerability and take immediate action to mitigate the risk.

Defensive priority

CVE-2026-54416 is rated HIGH with a CVSS score of 7.2; immediate defensive review is recommended.

Recommended defensive actions

• Review and apply vendor patches for Pluck CMS 4.7.21 immediately.
• Restrict file uploads to only necessary types and validate extensions thoroughly.
• Monitor for suspicious file uploads and PHP 8.x execution attempts.
• Consider implementing a Web Application Firewall (WAF) to detect and prevent attacks.
• Inventory and verify all Pluck CMS installations for potential exposure.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE description indicates Pluck CMS 4.7.21 has a remote code execution vulnerability via an unmodified uploaded file with a '.php8' extension, executable on PHP 8.x servers. Evidence is limited; further review of official records and vendor remediation is advised. The vulnerability allows an authenticated administrator to upload a file named e.g. shell.php8, which is stored unmodified and, on servers running PHP 8.x, is executed as PHP by the web server, resulting in remote code execution. Limited source details are available; defensive verification and review of official advisories are recommended.

Official resources