CVE-2026-65885
Authenticated arbitrary file upload in Gridbox Joomla extension; can lead to RCE.
Is CVE-2026-65885 being exploited?
Not confirmed. CVE-2026-65885 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-65885?
CVE-2026-65885 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-65885?
Yes. A fix has been recorded for CVE-2026-65885. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-65885 affect?
CVE-2026-65885 affects Gridbox Joomla extension <2.20.2, Joomla sites using Gridbox. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-65885?
Upgrade Gridbox to >=2.20.2, audit accounts/uploads, scan for web shells.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attackers can upload arbitrary files; when chained with CVE-2026-65884 enables authenticated RCE and full site compromise.
Immediate action required
- affected1.0.0-2.20.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.