CVE-2026-56290

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.

CVSS v4.0

10.0 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Red

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

30.38% chance of exploitation in the next 30 days, 98th percentile

CISA KEV

added 2026-07-07

Nuclei

critical · CWE-434

Published

2026-06-29

Updated

2026-08-12

Proof-of-concept exploits (4)

• sagsooz/PageBuilderCK-CVE-2026-56290-Exploit2★ · 2026-07-04
• MRCUKIL/com_pagebuilderck1★ · 2026-08-26
• ChiefYoru/CVE-2026-56290_PoC
• Jenderal92/CVE-2026-56290

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-56290.yaml

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52626

References

• CVE Record
• NVD entry

Related

• CVE-2023-5360
• CVE-2025-29927
• CVE-2026-21628
• CVE-2026-48907
• CVE-2026-48939
• CVE-2026-56291