CVE-2026-64873 regularlabs.com CVE debrief

Who should care

Defenders responsible for Joomla installations and network security should assess exposure and potential impact. They should verify if systems use the affected Cache Cleaner Pro extension and assess potential exposure to internal or reserved network services. Defenders should also monitor for suspicious activity related to the extension.

Why it matters

The CVE-2026-64873 vulnerability is a critical SSRF issue in the Cache Cleaner Pro extension for Joomla, allowing custom query URLs to access internal or reserved network services. Defenders should prioritize verifying exposure and assessing potential impact, focusing on systems using the affected extension.

• Verify exposure and potential impact on internal network services
• Assess and monitor for suspicious activity related to the extension

Technical summary

The Cache Cleaner Pro extension for Joomla is vulnerable to Server-Side Request Forgery (SSRF), allowing custom query URLs to access internal or reserved network services. This critical vulnerability has a CVSS score of 9.8. The vulnerability is caused by the extension's ability to make requests to internal or reserved network services without proper validation. Defenders should prioritize verifying exposure and assessing potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, focusing on systems using the affected extension.

Recommended defensive actions

• Verify if systems use the affected Cache Cleaner Pro extension
• Assess potential exposure to internal or reserved network services
• Monitor for suspicious activity related to the extension

Evidence notes

The CVE record and NVD detail page provide limited information about the vulnerability, with the NVD entry currently deferred. The source reference for Regularlabs provides additional context. Defenders should verify the affected scope and severity using the official advisory or CVE record. The vulnerability affects Joomla installations using the Cache Cleaner Pro extension.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.