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CVE-2026-73347 – Unauthenticated Privilege Escalation – TrueBooker WordPress Plugin ≤ 1.2.6

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Summary

CVE-2026-73347 is a critical unauthenticated privilege escalation vulnerability in the TrueBooker – Appointment Booking and Scheduler System WordPress plugin, affecting all versions up to and including 1.2.6. The flaw is classified as CWE-266 (Incorrect Privilege Assignment) and carries a CVSS v3.1 base score of 9.8 (Critical), as it allows a remote, unauthenticated attacker to escalate privileges without any user interaction.

Technical details

  • Root cause: The plugin incorrectly assigns or fails to properly restrict privilege levels within its user-handling logic, classified under CWE-266 (Incorrect Privilege Assignment).
  • Trigger conditions: No authentication or user interaction is required to exploit the flaw.
  • Attack vector: Network — the vulnerability is remotely exploitable over HTTP(S) against any internet-facing WordPress site running the affected plugin.
  • Impact: Successful exploitation allows an unauthenticated attacker to escalate privileges, which can lead to full compromise of confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • TrueBooker – Appointment Booking and Scheduler System (WordPress plugin, slug: truebooker-appointment-booking) — versions ≤ 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: Upgrade the TrueBooker plugin to version 1.2.7 or later, which resolves the privilege escalation issue.
  • If immediate patching is not possible: Restrict or disable public access to the plugin’s booking/user-management functionality, and monitor for unexpected privilege changes or new administrative accounts as a compensating control until the update can be applied.

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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