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CVE-2026-28140 – Unauthenticated Broken Access Control – JetFormBuilder WordPress Plugin ≤ 3.6.4.1

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Summary

CVE-2026-28140 is an unauthenticated broken access control (missing authorization) vulnerability in the JetFormBuilder WordPress plugin. It affects all versions up to and including 3.6.4.1 and is rated High severity (CVSS 7.5), allowing remote attackers to reach functionality that should be restricted without any authentication.

Technical details

  • Root cause: Missing authorization (CWE-862) — the plugin fails to properly enforce access controls on certain functionality.
  • Trigger conditions: No authentication and no user interaction are required to exploit the flaw.
  • Attack vector: Network — the weakness is reachable remotely over HTTP/HTTPS against an exposed WordPress site running the plugin.
  • Impact: Integrity impact rated High; confidentiality and availability are not impacted per the published CVSS metrics.

Affected software

  • JetFormBuilder WordPress plugin versions ≤ 3.6.4.1
  • Fixed in version 3.6.4.2

Severity

  • CVSS v3.1 base score: 7.5 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Update the JetFormBuilder plugin to version 3.6.4.2 or later.
  • If no patch can be applied: Restrict network access to affected WordPress sites and place a web application firewall in front of the application to filter unauthenticated requests to the plugin until the update is deployed.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: /wp-content/plugins/jetformbuilder/

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
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