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CVE-2026-39554 Elated-Themes CVE debrief

CVE-2026-39554 is a high-severity vulnerability in the Fidalgo WordPress theme, affecting versions up to 1.2.2. This vulnerability allows unauthenticated attackers to inject PHP objects, potentially leading to code execution, data breaches, or system compromise. With a CVSS score of 8.1, this issue demands immediate attention. The vulnerability was published on June 17, 2026, and last modified on the same day. Users of the Fidalgo theme should update to a patched version as soon as possible. The CVE record and NVD details provide further information on this vulnerability.

Vendor
Elated-Themes
Product
Fidalgo
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

Administrators and security teams responsible for WordPress installations, particularly those using the Fidalgo theme, should be aware of this vulnerability. Given its high severity and potential for exploitation, immediate action is recommended to mitigate risks.

Technical summary

CVE-2026-39554 is an unauthenticated PHP object injection vulnerability in the Fidalgo WordPress theme, affecting versions up to 1.2.2. This vulnerability is characterized by its high CVSS score of 8.1, indicating a high level of severity. The vulnerability's CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, showing that it can be exploited remotely without authentication, under high complexity conditions, with high impacts on confidentiality, integrity, and availability. The CWE-502 weakness classification applies, indicating a 'Deserialization of Untrusted Data' vulnerability.

Defensive priority

High

Recommended defensive actions

  • Update the Fidalgo WordPress theme to a version beyond 1.2.2 immediately.
  • Review and restrict access to sensitive areas of the WordPress installation.
  • Implement additional security measures such as Web Application Firewalls (WAFs) to detect and prevent exploitation attempts.
  • Regularly monitor WordPress installations for updates and apply them promptly.
  • Consider using security plugins that can help detect and mitigate PHP object injection attempts.
  • Limit the use of PHP object serialization in application code where possible.
  • Enhance logging and monitoring to quickly identify potential exploitation attempts.

Evidence notes

The information provided is based on data from official sources, including the CVE.org record and the NVD detail page. The CVE was published and modified on June 17, 2026. A reference from Patchstack provides additional context on the vulnerability.

Official resources

public