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CriticalA PHP security release fixes two CVSS 9.2 flaws, and PHP 8.1 and older get no patchWhat it means for your site
CVE-2026-64873CriticalCVSS 9.8CVE published 23 July 2026

Cache Cleaner (cachecleaner) below 10.0.0 - Authenticated SSRF, OS Command Injection and Path Traversal

Regular Labs Cache Cleaner before 10.0.0 is affected by several issues fixed in the coordinated Regular Labs security release of 22 July 2026 (no CVE assigned): custom query URLs able to reach private or reserved network services (SSRF); SiteGround cache purging that let request host values reach a shell command (OS command injection); custom folder and log paths accepting unsafe relative paths (path traversal); CDN provider credentials exposed in administrator request URLs; and administrator URL purges not requiring a valid token and cache-manage permission. Exploitation is largely from configured/administrator context, but the SSRF and command-injection paths are the notable ones. Update to Cache Cleaner 10.0.0 or later. CVE ids assigned by the Joomla CNA for this extension in the 22 July 2026 Regular Labs security release: CVE-2026-64871, CVE-2026-64872, CVE-2026-64873.

Is my site affected?

Affected
Cache Cleaner before 10.0.0
Fixed in
10.0.0
What to do
Update Cache Cleaner to 10.0.0 or later.
Check whether your sites are affected

How CVE-2026-64873 is scored

The base metrics as CISA-ADP published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

9.8 Critical

CVSS 3.1, scored by CISA-ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
PR:N Privileges required
None. No account needed
UI:N User interaction
None. Nobody has to be tricked into anything
S:U Scope
Unchanged. Contained to the extension it is in

What it does

C:H Confidentiality
High. Everything the site holds can be read
I:H Integrity
High. Data and files can be altered at will
A:H Availability
High. The site can be taken down

Timeline

  1. 23 July 2026CVE-2026-64873 record published by its CNA

Rule details

Other vulnerabilities in Cache Cleaner and Cache Cleaner

Updating for CVE-2026-64873 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extensions.

Cache Cleaner

Latest safe version: 10.0.0

Cache Cleaner

Latest safe version: 10.0.0

References

CVE-2026-64873 questions

Which versions are affected by CVE-2026-64873?
CVE-2026-64873 affects Cache Cleaner before 10.0.0. The fix is in 10.0.0.
How do I fix CVE-2026-64873?
Update Cache Cleaner to 10.0.0 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen.
How severe is CVE-2026-64873?
CISA-ADP scores it 9.8 (Critical) under CVSS 3.1. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything.

Running an affected version on a site you manage?

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This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 24 October 2026.