CVE-2026-78078
Helix Ultimate file upload bypass allows non-image files to be uploaded.
Is CVE-2026-78078 being exploited?
Not confirmed. CVE-2026-78078 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 0.26% probability of exploitation in the next 30 days.
How severe is CVE-2026-78078?
CVE-2026-78078 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-2026-78078?
Yes. A fix has been recorded for CVE-2026-78078. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-78078 affect?
CVE-2026-78078 affects Helix Ultimate < 2.2.10, JoomShaper Helix Ultimate extension, Joomla sites using Helix Ultimate. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78078?
Update Helix Ultimate to >=2.2.10; enforce server-side MIME/image validation and restrict uploads.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Disguised non-image uploads (e.g., web shells) can be placed via privileged upload paths, enabling remote code execution, site compromise, or privilege escalation.
Immediate action required
- affected1.0-2.2.9
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.