CVE-2026-78077
Stored XSS in Helix Ultimate menu JSON allows execution of malicious JS.
Is CVE-2026-78077 being exploited?
Not confirmed. CVE-2026-78077 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 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-78077?
CVE-2026-78077 is rated High with a CVSS score of 8.6. 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-2026-78077?
Yes. A fix has been recorded for CVE-2026-78077. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-78077 affect?
CVE-2026-78077 affects Helix Ultimate < 2.2.10, JoomShaper MegaMenu Layout & Embed inputs, 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-2026-78077?
Upgrade to Helix Ultimate 2.2.10, audit menu content, apply WAF XSS rules.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS via MegaMenu/Embed inputs; attackers can execute JS in visitors' or admins' browsers, enabling session theft, site defacement, or actions as logged-in users.
Patch when possible
- 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.