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CVE-2026-56290 (GCVE-0-2026-56290)

Vulnerability from cvelistv5 – Published: 2026-06-29 14:31 – Updated: 2026-08-12 13:53
VLAI CISA Previdian
Title
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
Summary
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.
Severity
10 (Critical)
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/AU:Y/U:Red
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 00:00 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Credits
Phil Taylor, mysites.guru
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 506817d1-03c3-41da-b990-e33f2ad9e33d

Vulnerability ID: CVE-2026-56290

Status: Confirmed

Status Updated: 2026-07-07 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-07
Asserted: 2026-07-07
Scope
Notes: KEV entry: Joomlack Page Builder Improper Access Control Vulnerability | Affected: Joomlack / Page Builder | Description: Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload. | 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: 2026-07-10 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-284
Feed CISA Known Exploited Vulnerabilities Catalog
Product Page Builder
Due Date 2026-07-10
Date Added 2026-07-07
Vendorproject Joomlack
Vulnerabilityname Joomlack Page Builder Improper Access Control Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-07-07 18:00 UTC | Updated: 2026-07-07 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6ee34d77-b707-46d5-baed-7361fcc5150c

Vulnerability ID: CVE-2026-56290

Status: Confirmed

Status Updated: 2026-07-07 17:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-07
Asserted: 2026-07-07
Scope
Notes: KEVIntel entry: Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 | Affected: joomlack.fr / JoomlaCK.fr Page Builder CK extension for Joomla | CVSS: 10.0 (CRITICAL) | EPSS: 0.00356 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
Vendor joomlack.fr
Product JoomlaCK.fr Page Builder CK extension for Joomla
Added Date 2026-07-07T17:00:54.263Z
Cvss Score 10.0
Epss Score 0.00356
Cvss Severity CRITICAL
Epss Percentile 0.27626
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-07-07 18:00 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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          "title": "Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension \u003c 3.6.0",
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            "engine": "Vulnogram 0.1.0-dev"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6ff30186-7fb7-4ad9-be33-533e7b05e586",
        "assignerShortName": "Joomla",
        "cveId": "CVE-2026-56290",
        "datePublished": "2026-06-29T14:31:37.952Z",
        "dateReserved": "2026-06-20T11:57:32.752Z",
        "dateUpdated": "2026-08-12T13:53:41.665Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.