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Findings

CVE-2026-4127

The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9.

Published Mar 21, 2026 · updated Jun 17, 2026

The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9. The function, which handles the AJAX action, does not perform any capability check via and also lacks nonce verification. This is in contrast to other AJAX handlers in the same plugin (e.g., and ) which properly check for and capabilities respectively. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enable or disable the site's optimization module by sending a POST request to admin-ajax.

Code

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Timeline

Detection, updates, and resolution for this record.

  1. Mar 21, 2026 · NIST NVD

    Detected

    The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9. The function, which handles the AJAX action, does not perform any capability check via and also lacks nonce verification. This is in contrast to other AJAX handlers in the same plugin (e.g., and ) which properly check for and capabilities respectively. This makes it possi

  2. Jun 17, 2026 · NIST NVD

    Updated

    The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9. The function, which handles the AJAX action, does not perform any capability check via and also lacks nonce verification. This is in contrast to other AJAX handlers in the same plugin (e.g., and ) which properly check for and capabilities respectively. This makes it possi

Sources

  • CVE.orgVulnerability recordCVE-2026-4127

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-4127

    The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9. The function, which handles the AJAX action, does not perform any capability check via `current_u

    nvd.nist.gov

References