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PatchSiren cyber security CVE debrief

CVE-2026-9278 Form Builder CP CVE debrief

CVE-2026-9278 is a Stored Cross-Site Scripting (XSS) vulnerability in the Form Builder CP WordPress plugin before version 1.2.47. The plugin does not properly sanitize a form configuration value before storing it and using it as part of a client-side script execution. This allows authenticated users with Editor-level access and above to perform Stored Cross-Site Scripting attacks against any visitor of a page rendering the affected form, even when the `unfiltered_html` capability is disallowed.

Vendor
Form Builder CP
Product
Form Builder CP
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-07-21
Advisory published
2026-06-15
Advisory updated
2026-07-21

Who should care

Users of the Form Builder CP WordPress plugin, particularly those with Editor-level access and above, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability exists in the Form Builder CP WordPress plugin before version 1.2.47. Authenticated users with Editor-level access and above can exploit this vulnerability to perform Stored Cross-Site Scripting attacks.

Defensive priority

High

Recommended defensive actions

  • Update the Form Builder CP WordPress plugin to version 1.2.47 or later.
  • Restrict Editor-level access and above to trusted users only.
  • Monitor for suspicious activity on pages rendering the affected form.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information can be found at [ref-4].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9278 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9278

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

  • CVE-2026-9278 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9278

    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.