CVE-2026-56290
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National Vulnerability Database Information
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.
CVSS Base Score: 9.8 (v3.1)
The CVSS Base Score is a score from 0 to 10 that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.
0.02.55.07.510.0
Published on: 06/29/2026 15:16:42
Last modified: 07/08/2026 13:37:08
NIST: CVE source from the National Vulnerability Database (NVD)
CVSS Metrics Details
- Base Severity: CRITICAL
- Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: NONE
- User Interaction: NONE
- Scope: UNCHANGED
- Confidentiality Impact: HIGH
- Integrity Impact: HIGH
- Availability Impact: HIGH
Common Weakness Enumeration (CWE)
Database CWE: v4.18
Fonte: MITRE CWE
FIRST Information
EPSS Score: 0.0291
The EPSS (Exploit Prediction Scoring System) is a score from 0 to 1 that indicates the probability that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.
0.00.250.50.751.0
Percentile: 0.8535
The Percentile indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.
0.00.250.50.751.0
*Data updated as of: 2026-07-09
CISA Information (Known Exploited Vulnerabilities)
The CISA KEV Catalog lists vulnerabilities that have been actively exploited in the real world. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.
CVE CVE-2026-56290 IS PRESENT in the CISA KEV Catalog!
- Vulnerability Name: Joomlack Page Builder Improper Access Control Vulnerability
- Short Description: Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.
- Date Added to KEV: 07/07/2026
- Vendor/Product: Joomlack / Page Builder
- Required Action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Due Date: 07/10/2026
Articles published on Red Hot Cyber
No articles present on Red Hot Cyber.
Exploit PoC from GitHub
- Jenderal92/CVE-2026-56290: CVE-2026-56290 - Mass Exploit for Joomla Com_pagebuilderck component (Unrestricted File Upload → RCE). Multi-threaded, automatic CSRF bypass, PHP shell uploader.
- shinthink/pbck-exploit: 📤 Mass exploitation framework for CVE-2026-56290 — Page Builder CK Joomla unauthenticated file upload to RCE
- sagsooz/PageBuilderCK-CVE-2026-56290-Exploit: Page Builder CK for Joomla - Unauthenticated SSRF / Remote File Write leading to PHP execution Exploiter
