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PatchSiren cyber security CVE debrief

CVE-2026-66479 Liquid Web / StellarWP CVE debrief

A Cross-Site Request Forgery (CSRF) vulnerability exists in the WPComplete plugin for WordPress, allowing for Stored XSS attacks. This issue affects WPComplete versions up to and including 2.9.5.6. The vulnerability enables attackers to trick users into performing unintended actions, potentially leading to Stored XSS attacks. Defenders should assess exposure and apply patches to prevent exploitation. The CVE Program and NVD provide official records of this vulnerability, with details on the affected WPComplete plugin versions.

Vendor
Liquid Web / StellarWP
Product
WPComplete
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-08
Original CVE updated
2026-10-08
Advisory published
2026-10-08
Advisory updated
2026-10-08

Who should care

Defenders responsible for WordPress installations with the WPComplete plugin should assess exposure and apply patches. This includes operators, platform administrators, vulnerability management teams, and security teams. They should prioritize verifying WPComplete plugin versions and applying patches to prevent exploitation.

Why it matters

Defenders should prioritize verifying WPComplete plugin versions and applying patches to prevent exploitation, as this vulnerability allows for Stored XSS attacks via CSRF.

  • Potential for Stored XSS attacks
  • Need for CSRF protection measures
  • Importance of verifying plugin versions

Technical summary

The WPComplete plugin for WordPress is vulnerable to CSRF, allowing for Stored XSS attacks. This issue affects WPComplete versions up to and including 2.9.5.6. The vulnerability enables attackers to trick users into performing unintended actions, potentially leading to Stored XSS attacks. Technical details indicate a need for CSRF protection measures and verifying plugin versions.

Defensive priority

Defenders should prioritize verifying WPComplete plugin versions and applying patches to prevent exploitation.

Recommended defensive actions

  • Verify WPComplete plugin version and apply patches
  • Implement CSRF protection measures
  • Monitor for suspicious activity

Evidence notes

The CVE Program and NVD provide official records of this vulnerability, with details on the affected WPComplete plugin versions. Evidence is based on CVE Program and NVD records. Affected versions are confirmed up to 2.9.5.6. Defenders should verify WPComplete plugin versions and apply patches. Official records indicate a CSRF vulnerability allowing Stored XSS attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66479 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66479

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

  • CVE-2026-66479 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66479

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

Supplemental references

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.