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PatchSiren cyber security CVE debrief

CVE-2026-40722 Yoast BV CVE debrief

The CVE-2026-40722 vulnerability is a Missing Authorization issue in Yoast SEO Premium, a popular WordPress plugin. This vulnerability allows attackers to exploit incorrectly configured access control security levels. The issue affects Yoast SEO Premium versions from n/a through 26.6. With a CVSS score of 5.5, the vulnerability is classified as MEDIUM severity. Users of the affected plugin should take immediate action to mitigate potential risks. The vulnerability was published on June 17, 2026, and last modified on the same day. No known ransomware campaigns have been associated with this vulnerability.

Vendor
Yoast BV
Product
Yoast SEO Premium
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

WordPress users with Yoast SEO Premium installed, particularly those using versions up to 26.6, should be aware of this vulnerability. Site administrators and security teams should assess their exposure and take necessary precautions.

Technical summary

The CVE-2026-40722 vulnerability is caused by a Missing Authorization issue in Yoast SEO Premium. This allows attackers to exploit incorrectly configured access control security levels. The vulnerability has a CVSS score of 5.5 and is classified as MEDIUM severity. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L. The weakness is categorized as CWE-862.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update Yoast SEO Premium to a version beyond 26.6
  • Review and correct access control configurations for the plugin
  • Monitor plugin usage and access logs for suspicious activity
  • Implement additional security measures, such as firewall rules and intrusion detection
  • Regularly update and patch all WordPress plugins and themes
  • Consider using a Web Application Firewall (WAF) to detect and prevent attacks

Evidence notes

The vulnerability information is based on data from the National Vulnerability Database (NVD) and Patchstack. The CVE record and NVD detail pages provide official information about the vulnerability. The Patchstack reference provides additional mitigation details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40722 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40722

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40722 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40722

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.