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TI-2026-13900 Aliases CVE-2026-16654GHSA-c5pr-2r2f-2j58

Cross-site scripting in ThemeFusion Avada Builder

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

The Avada (Fusion) Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'size' Shortcode Attribute in all versions up to, and including, 3.15.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress's wp_kses_post filter does not neutralize the payload because the injected content resides entirely within a shortcode attribute string containing no HTML angle brackets, causing kses to pass it through unchanged at save time.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00261 17th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ThemeFusionAvada (Fusion) Builderup to 3.15.6—No fix listedCNA
  • Avada (Fusion) Builder VendorThemeFusion Affected up to 3.15.6 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-16654
  2. 2026-10-03 Alias added: GHSA-c5pr-2r2f-2j58

References

Other 2

  • TI-2022-01267 Fusion Builder < 3.6.2 - Unauthenticated SSRF CVSS 3.1CRITICAL 9.8
  • TI-2026-05505 Injection in ThemeFusion Avada Builder CVSS 3.1CRITICAL 9.8
  • TI-2024-02175 Avada <= 7.11.6 - Unauthenticated Sensitive Information Exposure via Form Uploads Directory Listing CVSS 3.1MEDIUM 5.3
  • TI-2024-12389 Avada Theme <= 7.11.13 - Unauthenticated Arbitrary Shortcode Execution CVSS 3.1CRITICAL 9.8
  • TI-2026-15146 Avada <= 7.16 and Fusion Builder <= 3.16 - Unauthenticated Remote Code Execution via Arbitrary File Write CVSS 3.1CRITICAL 9.8
  • TI-2026-07656 Avada (Fusion) Builder <= 3.15.3 - Unauthenticated Arbitrary File Deletion via Form Entry Value CVSS 3.1CRITICAL 9.1
See all 57 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences