CVE-2026-56290
Joomlack Page Builder Improper Access Control Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
June 29, 2026, 3:16 p.m.
Last Modified :
July 8, 2026, 1:37 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.
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.
Unknown
https://www.joomlack.fr/en/joomla-extensions/page-builder-ck ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56290
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 6ff30186-7fb7-4ad9-be33-533e7b05e586 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update the Joomla extension Page Builder CK.
- Restrict file upload permissions.
- Validate uploaded file types.
Public PoC/Exploit Available at Github
CVE-2026-56290 has a 7 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-56290.
| URL | Resource |
|---|---|
| https://www.joomlack.fr/ | Product |
| https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3 | Issue Tracking Patch |
| https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/ | Exploit Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-56290 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-56290
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.
Python
None
Python CSS PHP
Fonte de pesquisa sobre cybersegurança em notebook LM, ao qual foi incluído bases de consulta-lo sobre duvidas sobre cybersegurança, vulnerabilidades e técnicas de ataques.
CVE-2026-56290 - Mass Exploit for Joomla Com_pagebuilderck component (Unrestricted File Upload → RCE). Multi-threaded, automatic CSRF bypass, PHP shell uploader.
cve-2026-56290 ethical-hacking exploit file-upload joomla penetration-testing rce unrestricted-file-upload vulnerability com-pagebuilderck joomla-exploit
Python
📤 Mass exploitation framework for CVE-2026-56290 — Page Builder CK Joomla unauthenticated file upload to RCE
exploit file-upload joomla pentesting python rce security-tools vulnerability-scanner cve-2026-56290 pagebuilderck
Python
Page Builder CK for Joomla - Unauthenticated SSRF / Remote File Write leading to PHP execution Exploiter
Python
Panel de ciberamenazas que se actualiza solo: nuevas amenazas y vulnerabilidades activas cada 6 horas.
CSS Python HTML JavaScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-56290 vulnerability anywhere in the article.
-
security.nl
Joomla-websites aangevallen via kritieke lekken in page builder-extensies
Joomla-websites worden actief aangevallen via twee kritieke kwetsbaarheden in page builder-extensies voor het platform, zo meldt het Amerikaanse cyberagentschap CISA. Via de beveiligingslekken in Page ... Read more
-
The Hacker News
CISA Adds 4 Actively Exploited Adobe, Joomla, and Langflow Flaws to KEV
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added four security flaws to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The ... Read more
The following table lists the changes that have been made to the
CVE-2026-56290 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:joomlack:page_builder_ck:*:*:*:*:*:joomla!:*:* versions up to (including) 3.6.0 OR *cpe:2.3:a:joomlack:page_builder_ck:*:*:*:*:*:joomla!:*:* versions up to (excluding) 3.6.0 Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 08, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-07T17:45:15.592601Z'} {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-30T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 07, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290 Changed SSVC {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-30T00:00:00+00:00'} {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-07T17:45:15.592601Z'} -
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Jul. 07, 2026
Action Type Old Value New Value Added Date Added 2026-07-07 Added Due Date 2026-07-07 Added Required Action 2026-07-07 Added Vulnerability Name 2026-07-07 -
CVE Modified by [email protected]
Jul. 05, 2026
Action Type Old Value New Value Added CWE CWE-434 Removed CWE CWE-284 -
Initial Analysis by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 Added CPE Configuration OR *cpe:2.3:a:joomlack:page_builder_ck:*:*:*:*:*:joomla!:*:* versions up to (including) 3.6.0 Added Reference Type Joomla! Project: https://www.joomlack.fr/ Types: Product Added Reference Type CISA-ADP: https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3 Types: Issue Tracking, Patch Added Reference Type CISA-ADP: https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/ Types: Exploit, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-29T15:14:44.880377Z'} {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-30T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 30, 2026
Action Type Old Value New Value Added Reference https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3 Added Reference https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-56290', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-29T15:14:44.880377Z'} -
New CVE Received by [email protected]
Jun. 29, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'joomlack.fr', 'product': 'JoomlaCK.fr Page Builder CK extension for Joomla', 'versions': [{'status': 'affected', 'version': '1.0-3.6.0'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 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 Added CWE CWE-284 Added Reference https://www.joomlack.fr/