CVE-2026-56290

CVE Enrichment

CVSS: 10.0 CRITICAL
EPSS: 30.87%
EPSS Percentile: 98.22%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: security@joomla.org
Published: 29-Jun-2026 22:16
Last Modified: 08-Oct-2026 02:17
EPSS Date: 2026-10-12
CWE: CWE-434

CVSS Vector


            CVSS: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

CISA KEV Details

Date Added: 2026-07-07
Remediation Due: 2026-07-10
Known Ransomware Campaign Use: Unknown
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.
Notes: 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

Affected Products / Versions

joomlack / page_builder_ck
Version / affected range: * · before (exclusive) 3.6.0
cpe:2.3:a:joomlack:page_builder_ck:*:*:*:*:*:joomla\!:*:*

References

Last enrichment sync: 13-Oct-2026 03:57
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-56290 Recorded Future Identifies 85 High-Impact Vulnerabilities in July, Many Actively Exploited

CVE (80)

Malware (4)

Threat Actors (8)

Vendors (25)

Products (70)

Tools (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.