Security readout for executives and security teams
Plain-English summary
This is a reflected cross-site scripting issue in ThemeFusion Fusion Builder, also described as the WordPress Avada Builder plugin, through version 3.11.1. An attacker would need a user to interact with crafted content or a link. Successful exploitation could expose data, alter page behavior, or affect availability at a limited level.
Executive priority
Treat this as a high-priority web application hygiene issue for any internet-facing WordPress site using the affected builder. It is not confirmed as actively exploited in the provided evidence, but the low attack complexity and no-authentication requirement justify timely inventory and remediation.
Technical view
CVE-2023-39306 is CWE-79 improper neutralization during web page generation. CVSS 3.1 is 7.1 high: network reachable, low complexity, no privileges required, user interaction required, changed scope, and low confidentiality, integrity, and availability impact. The source bundle does not identify a fixed version.
Likely exposure
Exposure is most likely on WordPress sites running ThemeFusion Fusion Builder or Avada Builder through 3.11.1. Public-facing marketing or content sites are the primary concern because reflected XSS usually depends on browser interaction with attacker-controlled input.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Risk is still meaningful because the flaw is network reachable and needs no attacker authentication, but exploitation requires user interaction.
Researcher notes
Evidence is sparse. Product naming differs between Avada Builder and Fusion Builder, and no fixed version is named in the supplied bundle. Avoid asserting exploitation or patch details beyond the CVE and Patchstack records.
Mitigation direction
- Inventory WordPress sites using Fusion Builder or Avada Builder.
- Identify installations at or below version 3.11.1.
- Check ThemeFusion and Patchstack guidance for the fixed version or vendor mitigation.
- Update only according to confirmed vendor guidance.
- Temporarily disable or restrict the plugin where risk is unacceptable.
Validation and detection
- Confirm plugin name and installed version on each WordPress instance.
- Review vendor release notes or Patchstack for remediation status.
- Check web logs for suspicious requests targeting affected pages or parameters.
- Verify no untrusted reflected input executes in browser context.
- Retest after applying the vendor-confirmed update or mitigation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-39306 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L2.83.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.