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CVE-2026-12526 – Unauthenticated Admin Account Takeover – Advanced Custom Fields: Extended < 0.9.2.7

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Summary

CVE-2026-12526 is an improper authentication vulnerability (CWE-287) in the Advanced Custom Fields: Extended WordPress plugin (ACF Extended) affecting versions before 0.9.2.7. The flaw resides in the plugin’s front-end Forms module and allows an unauthenticated attacker to overwrite an existing administrator’s password, resulting in full account takeover. The issue carries a CVSS v3.1 base score of 8.1 (High).

Technical details

  • Root cause: The update-user action of the front-end Forms module does not verify that the requester is authorized to edit the specific user account being targeted; it only performs a capability check when the submitted role is administrator or super_admin, and even that check does not confirm the requester may act on the targeted account.
  • Trigger conditions: Exploitation requires a site to expose a publicly reachable front-end form whose user-update action targets an existing administrator account — either a fixed target or one mapped to a visitor-submitted field — and maps the password field to visitor-supplied input. The plugin’s default form target is the submitting user, so a site is only exploitable if an administrator has explicitly configured the form this way.
  • Attack vector: Network — no authentication is required to submit the form.
  • Impact: An unauthenticated visitor can overwrite the targeted administrator’s password, leading to complete compromise of confidentiality, integrity, and availability of the WordPress site.

Affected software

  • Advanced Custom Fields: Extended (ACF Extended) WordPress plugin, versions prior to 0.9.2.7

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update Advanced Custom Fields: Extended to version 0.9.2.7 or later, where the authorization check has been fixed.
  • If immediate patching is not possible: Audit all front-end Forms created with the plugin and remove or disable any user-update form that targets an administrator/super_admin account or maps a password field to visitor input; restrict public access to any such forms until the plugin is updated.

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-extended/

References

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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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