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CVE-2026-61962 – Unauthenticated Arbitrary Code Execution – WP BASE Booking Plugin ≤ 6.3.0

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Summary

CVE-2026-61962 is a critical, unauthenticated arbitrary code execution (code injection) vulnerability affecting the WP BASE Booking of Appointments, Services and Events plugin for WordPress, developed by Hakan Ozevin. The flaw affects all versions up to and including 6.3.0 and has been assigned the maximum CVSS v3.1 base score of 10.0, reflecting that it can be exploited over the network without authentication or user interaction and results in complete compromise of confidentiality, integrity, and availability of the affected WordPress site.

Technical details

  • Root cause: The plugin fails to properly control the generation of code, classified as CWE-94 (Improper Control of Generation of Code / Code Injection), allowing attacker-supplied input to be executed as code by the underlying PHP/WordPress environment.
  • Trigger conditions: The vulnerable code path is reachable without any authentication, privileges, or user interaction, meaning any unauthenticated remote attacker can trigger it directly against an exposed WordPress installation running the plugin.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), with a scope change (S:C) indicating the vulnerability can impact resources beyond the vulnerable component itself.
  • Impact: Successful exploitation grants the attacker the ability to execute arbitrary code on the server hosting the WordPress site, which can lead to full site takeover, data theft, defacement, or use of the server as a foothold for further attacks.

Affected software

  • WP BASE Booking of Appointments, Services and Events (WordPress plugin) — all versions up to and including 6.3.0
  • Fixed in version 6.3.1

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the WP BASE Booking of Appointments, Services and Events plugin to version 6.3.1 or later, where the vulnerability has been remediated.
  • If immediate patching is not possible:
    • Temporarily deactivate the WP BASE Booking plugin until the update can be applied.
    • Restrict or monitor external access to the affected WordPress site/admin endpoints via a web application firewall (WAF) to reduce exposure while patching is scheduled.
    • Audit site and server logs for signs of code execution or unexpected file changes that may indicate prior exploitation attempts.
  • Ensure WordPress core, themes, and all plugins are kept up to date on an ongoing basis to minimize exposure to similar code injection flaws.

References

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