CVE-2026-73373
Unrestricted SHTML uploads in Joomla allow server-side code execution.
Is CVE-2026-73373 being exploited?
Not confirmed. CVE-2026-73373 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 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-73373?
CVE-2026-73373 is rated High with a CVSS score of 8.9. 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-2026-73373?
Yes. A fix has been recorded for CVE-2026-73373. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73373 affect?
CVE-2026-73373 affects Joomla 1.0.0-5.4.7, Joomla 6.0.0-6.1.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73373?
Update to vendor-fixed Joomla release and block/disable SHTML execution.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution: attacker can upload .shtml files that execute on servers, enabling arbitrary code execution under web-server context.
Patch when possible
- affected1.0.0-5.4.6
- affected6.0.0-6.1.2
- affected1.0.0-3.3.0
- affected4.0.0-4.2.0
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.