CVE-2026-56290

Risk summary

Senserva AI Opinion for CVE-2026-56290

CVE-2026-56290 is an improper access control flaw in Joomlack Page Builder that lets an unauthenticated attacker upload arbitrary files, which opens a path to remote code execution on the host. Because the upload requires no authentication, any internet-reachable site running the affected plugin is directly exposed with no login barrier to cross. CISA added it to the Known Exploited Vulnerabilities catalog on 2026-07-07, so this is confirmed in-the-wild exploitation, not theoretical. The low EPSS figure of 3 percent understates the real risk here: EPSS models predicted activity, but KEV inclusion means exploitation is already observed, so treat KEV as the deciding signal. No ransomware campaign has been tied to it yet, but an uploaded web shell gives an attacker code execution that can lead to data theft, defacement, pivoting, or later ransomware staging regardless. Severity is Critical with a CVSS score of 9.8, consistent with an unauthenticated remote code execution primitive.

Do this: Identify every site running Joomlack Page Builder and confirm the installed version, then apply the vendor's patched release as your first priority. If a patch cannot be applied immediately, take affected sites offline or block external access to the plugin's upload endpoints at the web application firewall or reverse proxy. Because active exploitation is confirmed, assume compromise on any exposed instance: inspect upload directories for unexpected PHP or executable files, review web server and access logs for POST requests to upload handlers from unknown sources, and check for new admin accounts, modified files, and outbound connections. Rotate credentials and secrets stored on affected hosts, and preserve logs before cleanup so you can scope the intrusion. Meet the CISA KEV remediation deadline, which for federal agencies is fixed but which every operator should treat as an urgent ceiling, not a target.

AI-generated from public data, 2026-07-22. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-56290

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for CVE-2026-56290

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

CISA required action

Federal (BOD 22-01) remediation due date: 2026-07-10 (past due).

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.

Official fix for CVE-2026-56290

Check the vendor's security advisory channel for the patched Page Builder versions and workarounds.

Common questions about CVE-2026-56290

Is CVE-2026-56290 actively exploited?

Yes. CVE-2026-56290 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-07-07, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 19%.

What is the CISA deadline and required action for CVE-2026-56290?

CISA set the federal (BOD 22-01) remediation due date at 2026-07-10, which has passed; treat any unremediated system as overdue. The verbatim 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.

What fixes CVE-2026-56290?

Check the vendor's security advisory for the patched Page Builder versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2026-56290?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-56290's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

Authoritative references