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CVE-2026-18776 – Unauthenticated Account Takeover – TrueBooker WordPress Plugin (before 1.2.7)

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Summary

CVE-2026-18776 is a critical improper privilege management / broken access control vulnerability in the TrueBooker Appointment Booking plugin for WordPress. Versions before 1.2.7 expose an AJAX action that lets unauthenticated attackers change the email address on any account, including administrators, then abuse the standard password reset flow to seize full control of the account. The flaw is rated CRITICAL with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: one or more AJAX handlers registered by the plugin do not verify that the requesting user is authenticated or owns the account being modified before updating account data.
  • Trigger condition: an unauthenticated request supplying a target user ID and a new email address is accepted and applied by the plugin, with no capability or nonce-ownership check tying the request to the account owner.
  • Attack vector: network-based, no authentication or user interaction required (AV:N, PR:N, UI:N).
  • Impact: the attacker overwrites the victim’s account email, then requests a password reset delivered to the attacker-controlled address, resulting in full account takeover — including administrator accounts — and complete loss of confidentiality, integrity, and availability for the site.

Affected software

  • TrueBooker – Appointment Booking (WordPress plugin), all versions prior to 1.2.7

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: upgrade TrueBooker – Appointment Booking to version 1.2.7 or later, where authorization checks were added to the affected AJAX handlers.
  • If patching cannot be performed immediately: disable or remove the TrueBooker plugin until it can be updated, and review WordPress user accounts for unexpected email address changes or unauthorized password resets as an indicator of prior 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/truebooker-appointment-booking/

References

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Map your entire attack surface (continously)

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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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