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PatchSiren cyber security CVE debrief

CVE-2026-12430 creativethemeshq CVE debrief

The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 2.1.45 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Vendor
creativethemeshq
Product
Blocksy Companion
CVSS
MEDIUM 4.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-19
Original CVE updated
2026-06-22
Advisory published
2026-06-19
Advisory updated
2026-06-22

Who should care

Administrators of WordPress multi-site installations or installations where unfiltered_html has been disabled and using Blocksy Companion plugin versions up to and including 2.1.45 should prioritize updating to a patched version to prevent potential Stored Cross-Site Scripting attacks.

Technical summary

The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings. The vulnerability exists due to insufficient input sanitization and output escaping in versions up to and including 2.1.45. Authenticated attackers with editor-level permissions and above can inject arbitrary web scripts into pages, which execute when a user accesses an injected page. The vulnerability is only exploitable in multi-site installations or where unfiltered_html has been disabled.

Defensive priority

Medium priority due to the requirement for authenticated access with editor-level permissions and the specific conditions required for exploitation (multi-site installations or unfiltered_html disabled).

Recommended defensive actions

  • Update Blocksy Companion plugin to a version beyond 2.1.45.
  • Review and enhance input sanitization and output escaping for admin settings in the plugin.
  • Monitor for suspicious admin activity and injected scripts.
  • Consider disabling unfiltered_html if not required.
  • Regularly update WordPress and plugins.

Evidence notes

The CVE record was published on 2026-06-19T06:17:01.513Z and was last modified on 2026-06-22T16:43:14.450Z. The vulnerability was reported by [email protected]. Multiple references to code reviews and changesets are provided, indicating thorough analysis of the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12430 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12430

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

  • CVE-2026-12430 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12430

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.41/framework/extensions/product-reviews/extension.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.41/framework/extensions/product-reviews/views/single-top.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.41/framework/extensions/product-reviews/views/single-top.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.45/framework/extensions/product-reviews/extension.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.45/framework/extensions/product-reviews/views/single-top.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.45/framework/extensions/product-reviews/views/single-top.php

    [email protected]

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.