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CVE-2026-16142 – Unauthenticated Account Takeover – TrueBooker WordPress Plugin (≤ 1.2.6)

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Summary

CVE-2026-16142 is a critical unauthenticated account takeover vulnerability in the TrueBooker – Appointment Booking and Scheduler System WordPress plugin, affecting all versions up to and including 1.2.6. The flaw stems from an authorization bypass (CWE-639) that allows an attacker to change the email address of any WordPress user, including administrators, and then leverage the standard password-reset flow to seize the account. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the plugin’s add_front_user_update() AJAX handler accepts an attacker-supplied truebooker_wp_user_id parameter and passes it directly to WordPress’s wp_update_user() function without verifying the requester is authorized to modify that user.
  • Trigger conditions: the AJAX action is reachable by unauthenticated visitors; no login, nonce validation tied to the target user, or capability check is enforced.
  • Attack vector: network-based, requires no user interaction and no prior authentication (AV:N/AC:L/PR:N/UI:N).
  • Impact: an attacker can overwrite the email address on any account (including administrators), then trigger WordPress’s built-in password reset to receive the reset link at an attacker-controlled address, resulting in full account takeover and complete loss of confidentiality, integrity, and availability of the site.

Affected software

  • TrueBooker – Appointment Booking and Scheduler System (WordPress plugin) — versions up to and including 1.2.6

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 the TrueBooker – Appointment Booking and Scheduler System plugin to a version newer than 1.2.6 as soon as the vendor releases a fix; confirm the changelog explicitly addresses the truebooker_wp_user_id / add_front_user_update() authorization issue before considering the site remediated.
  • If no patch is yet available: disable or remove the TrueBooker plugin until a fixed version is confirmed, restrict access to wp-admin/admin-ajax.php actions related to the plugin at the web server or WAF layer, and monitor administrator account email addresses for unauthorized changes.

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/truebooker-appointment-booking/

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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