CVE-2026-39560 Select-Themes CVE debrief

Who should care

Administrators and security teams responsible for managing WordPress installations, particularly those using the Hiroshi theme, should be aware of this vulnerability. Given the high severity and potential for exploitation, immediate attention is necessary to prevent potential attacks.

Technical summary

CVE-2026-39560 is an unauthenticated PHP object injection vulnerability in the Hiroshi theme, affecting versions up to 1.5.1. This vulnerability is characterized by its high CVSS score of 8.1, with an attack vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a high level of exploitability and potential impact. The vulnerability is classified under CWE-502, 'Deserialization of Untrusted Data'.

Defensive priority

High

Recommended defensive actions

• Update the Hiroshi theme to a version beyond 1.5.1, if available.
• Implement web application firewalls (WAFs) to detect and block suspicious traffic.
• Regularly monitor WordPress installations for updates and security patches.
• Restrict access to sensitive areas of the website.
• Use secure protocols for data transmission.
• Conduct regular security audits and vulnerability assessments.
• Isolate affected systems until patched.

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and Patchstack. The CVE record and NVD detail pages provide comprehensive information about the vulnerability, including its CVSS score, vector, and potential impacts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.