CVE-2026-56290

CVE-2026-56290 is a critical-severity vulnerability in Joomlack Page Builder Ck with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-07-07). The underlying weakness is classified as CWE-434.

Key facts

Description

The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.

Frequently asked questions

What is CVE-2026-56290?
The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
How severe is CVE-2026-56290?
CVE-2026-56290 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-56290 being actively exploited?
Yes. CVE-2026-56290 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-07-07, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-56290?
CVE-2026-56290 affects Joomlack Page Builder Ck. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-56290?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-56290 published?
CVE-2026-56290 was published on 2026-06-29 and last updated on 2026-07-08.

References

Affected products (1)

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