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CVE-2026-18432 – Unauthenticated Privilege Escalation to Administrator – Frontend Admin by DynamiApp

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Summary

CVE-2026-18432 is a critical privilege escalation vulnerability in the Frontend Admin by DynamiApps WordPress plugin (also distributed as "acf-frontend-form-element"), affecting all versions up to and including 3.29.9. The flaw allows unauthenticated attackers to escalate privileges to Administrator by abusing an improper input validation check on a user-supplied parameter. The issue is rated CRITICAL with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: the ActionUser::conditions_logic() function gates its authorization check behind an is_numeric() test on the item_id (user ID) parameter.
  • Trigger condition: supplying a non-numeric string value (e.g., a value like "1one") for the user ID parameter causes the numeric check to fail, which skips the authorization/ownership validation entirely.
  • Because WordPress performs type coercion on such values, the attacker-controlled input can still resolve to a valid target, such as user ID 1 (commonly the first administrator account).
  • Attack vector: the vulnerability is exploited via an unauthenticated AJAX endpoint exposed by the plugin, requiring no authentication or user interaction.
  • Impact: full privilege escalation to Administrator, resulting in complete compromise of confidentiality, integrity, and availability of the WordPress site.

Affected software

  • Frontend Admin by DynamiApps (WordPress plugin), versions 0 through 3.29.9 (all versions up to and including 3.29.9).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update Frontend Admin by DynamiApps to a version beyond 3.29.9 that fixes the missing authorization check on the item_id parameter, once the vendor releases a patched build.
  • If no patch is yet available: disable or deactivate the plugin until a fix is released, especially on internet-facing sites; restrict access to the plugin’s AJAX endpoints via network-level controls (e.g., WAF rules blocking non-numeric values in the affected parameter); monitor for unexpected administrator account creation or role changes as an indicator of exploitation.

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/acf-frontend-form-element/

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.

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