CVE-2026-56290
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
30.9%
98.2th percentile
CISA KEV
Listed
Added 2026-07-07 · patch by 2026-07-10
Weakness / dates
CWE-434
Published 2026-06-29 · modified 2026-07-24
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2026-06-29 — Published (NVD)
- 2026-07-07 — Added to CISA KEV (actively exploited)
- 2026-07-10 — CISA patch-by deadline
- 2026-07-24 — Last modified (NVD)
Description
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.