PatchTheCVECVE-2026-56290: Joomlack Page Builder Improper Access Control Vulnerability
CVE-2026-56290 is a critical-severity flaw (CVSS 9.8) affecting page builder ck, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
Why this priority
- Critical severity
- EPSS top 2%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 30.9% (top 2%) |
| CISA exploited list | Yes, fix due 2026-07-10 |
| Weakness | CWE-434 |
| Published | 2026-06-29 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Exploit-DB: Joomla Page Builder CK 3.5.10 - Arbitrary File Upload
- Nuclei scan template: Page Builder CK <= 3.5.10 - Unauthenticated Arbitrary File Upload
- GitHub PoC: Jenderal92/CVE-2026-56290 (5 stars)
- GitHub PoC: shinthink/pbck-exploit (3 stars)
- GitHub PoC: sagsooz/PageBuilderCK-CVE-2026-56290-Exploit (2 stars)
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-56290?
page builder ck: upgrade to 3.6.0. Exact commands for each OS are on this page.
Is CVE-2026-56290 being exploited?
Yes. CVE-2026-56290 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-56290 affect?
CVE-2026-56290 affects page builder ck. Severity is critical (CVSS 9.8). Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and le
How urgent is CVE-2026-56290?
Priority 97/100. Critical severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action