{"cve":{"cve_id":"CVE-2026-56290","is_kev":true,"kev_date_added":"2026-07-07","kev_vendor_project":"Joomlack","kev_product":"Page Builder","kev_vulnerability_name":"Joomlack Page Builder Improper Access Control Vulnerability","kev_short_description":"Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.","kev_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.","kev_due_date":"2026-07-10","kev_known_ransomware":false,"kev_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","kev_cwes":["CWE-284"],"epss_score":0.30375,"epss_percentile":0.98091,"epss_as_of":"2026-08-26","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.","published_at":"2026-06-29T14:31:37.952000Z","last_modified_at":"2026-07-24T13:31:02.867000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":10.0,"cvss_v4_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/AU:Y/U:Red","cvss_v4_severity":"CRITICAL","ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-434"],"nvd_references":["https://www.joomlack.fr/"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":true,"trended_number_one":true,"trending_peak_score":0.7016925414634094,"trending_peak_rank":1,"started_trending_at":"2026-07-28T01:04:53.289797Z","trended_number_one_at":"2026-07-28T19:04:53.315645Z","summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-29T23:46:59.033383Z","updated_at":"2026-08-21T10:44:59.262225Z"},"effective_severity":"CRITICAL","badges":["kev","exploit","was_number_one"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"H","value_label":"High"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"H","value_label":"High"},{"metric":"SA","name":"Availability (Subsequent System)","value":"H","value_label":"High"},{"metric":"E","name":"E","value":"A","value_label":"Adjacent"},{"metric":"AU","name":"AU","value":"Y","value_label":"Y"},{"metric":"U","name":"U","value":"Red","value_label":"Red"}]},"affected":[{"vendor_slug":"joomlack","vendor_name":"joomlack","product_slug":"page-builder-ck","product_name":"page_builder_ck","version_start":null,"version_start_inclusive":null,"version_end":"3.6.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:joomlack:page_builder_ck:*:*:*:*:*:joomla\\!:*:*"},{"vendor_slug":"joomlack.fr","vendor_name":"joomlack.fr","product_slug":"joomlack.fr-page-builder-ck-extension-for-joomla","product_name":"JoomlaCK.fr Page Builder CK extension for Joomla","version_start":"1.0-3.6.0","version_start_inclusive":true,"version_end":"1.0-3.6.0","version_end_inclusive":true,"cpe23_uri":"cve5:joomlack.fr:joomlack.fr-page-builder-ck-extension-for-joomla:1.0-3.6.0:1.0-3.6.0"}],"exploit_refs":[{"source":"exploit-db","kind":"exploit-db","url":"https://www.exploit-db.com/exploits/52626","title":"Joomla Page Builder CK  3.5.10 -  Arbitrary File Upload","author":"M@rAz Ali","disclosed_at":"2026-07-08"},{"source":"nuclei","kind":"nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-56290.yaml","title":"Page Builder CK <= 3.5.10 - Unauthenticated Arbitrary File Upload","author":"panchiko-p,0x_Akoko","disclosed_at":null}],"news":[],"references":[{"url":"https://www.joomlack.fr/","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-29T14:31:37.952000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-07-04T01:43:39.485079Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-04T01:43:39.485079Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-07-04T01:43:39.485079Z","label":"CVSS score revised","source":"nvd"},{"type":"cisa_reported","at":"2026-07-07T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-07-07T18:20:37.045673Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"exploit_known","at":"2026-07-08T00:00:00Z","label":"Public exploit available","source":"exploit-db"},{"type":"poc_available","at":"2026-07-21T21:44:53.973869Z","label":"Public PoC available","source":"nuclei"},{"type":"started_trending","at":"2026-07-28T01:04:53.289797Z","label":"Started trending","source":null},{"type":"reached_number_one","at":"2026-07-28T19:04:53.315645Z","label":"Reached #1 trending","source":null}]}