Is CVE-2026-54194 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-54194 being exploited in the wild.

How severe is CVE-2026-54194?

Critical severity, with a CVSS score of 9.8, published 17 June 2026.

Which products and versions are affected?

ThemeFusion Fusion Builder <= 3.15.4.

Is there a fix for CVE-2026-54194?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-54194 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-54194?

Check whether you run ThemeFusion Fusion Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54194: ThemeFusion Fusion Builder PHP Object Injection

Q: Is there a fix for CVE-2026-54194?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-54194 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-54194?

Check whether you run ThemeFusion Fusion Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54194 · Severity: critical · CVSS 9.8 · Published 2026-06-17

Fusion Builder, a popular page-building tool for WordPress websites, contains a critical security flaw. This vulnerability allows an attacker to inject malicious data that the website then processes as code. If exploited, this could lead to a total takeover of the website, including the theft of sensitive data, site defacement, or the installation of malware.

Technologies: ThemeFusion Fusion Builder. Vendors: ThemeFusion.

Quick answers

Is CVE-2026-54194 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-54194 being exploited in the wild.
How severe is CVE-2026-54194?: Critical severity, with a CVSS score of 9.8, published 17 June 2026.
Which products and versions are affected?: ThemeFusion Fusion Builder <= 3.15.4.
Is there a fix for CVE-2026-54194?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-54194 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-54194?: Check whether you run ThemeFusion Fusion Builder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A PHP Object Injection vulnerability exists in ThemeFusion Fusion Builder (versions <= 3.15.4) due to the deserialization of untrusted data (CWE-502). While the advisory title mentions 'Contributor' level, the CVSS vector (PR:N) and CISA metadata suggest the flaw may be automatable and potentially reachable without high privileges. If a suitable Property-Oriented Programming (POP) chain is present on the server, an attacker can leverage this to achieve remote code execution, SQL injection, or arbitrary file access. The issue is resolved in version 3.15.5.

Affected products

ThemeFusion Fusion Builder <= 3.15.4

Timeline

2026-06-10: other: Reported by researcher daroo
2026-06-15: disclosed: Vulnerability disclosed by Patchstack
2026-06-17: advisory: NVD published date

References

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