What is CVE-2026-6279?

CVE-2026-6279 is a critical-severity vulnerability in Themefusion Avada (Fusion) Builder, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-05-21.

How severe is CVE-2026-6279?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-6279 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Themefusion Avada (Fusion) Builder

CVE-2026-6279

The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the `wp_conditional_tags` case in `Fusion_Buil…

EPSS: 0.001 (33.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Themefusion Avada (Fusion) Builder — versions 0

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-6279?: CVE-2026-6279 is a critical-severity vulnerability in Themefusion Avada (Fusion) Builder, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-05-21.
How severe is CVE-2026-6279?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-6279 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.