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Vulnerabilities

Vulnerability · CVE-2023-39306

avada fusion_builder Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Published Oct 13, 2026 · catalog updated Oct 13, 2026 · avada fusion_builder Improper Neutralization

Patch now

CVE-2023-39306 is in the CISA known-exploited catalog. Confirm avada fusion_builder Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (avada fusion_builder Improper Neutralization).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.39%
Remediation
Remediation guidance
Affected products
vendor avada fusion_builder

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeFusion Fusion Builder allows Reflected XSS.This issue affects Fusion Builder: from n/a through 3.11.1.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor avada fusion_builderversion unspecified

How to fix CVE-2023-39306

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2023-39306 is in the CISA known-exploited catalog. Confirm avada fusion_builder Improper Neutralization against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.39%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · VulnCheck KEV

    Detected

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeFusion Fusion Builder allows Reflected XSS.This issue affects Fusion Builder: from n/a through 3.11.1.

  2. Oct 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2023-39306

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-39306

    30-day exploitation probability 0.4%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2023-39306

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeFusion Fusion Builder allows Reflected XSS.This issue affects Fusion Builder: from n/a through 3.11.1.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.