Greeny WordPress Theme Deserialization Flaw CVE-2026-93940 Puts V2.10.0 Sites at Critical Risk

ThemeREX Group’s Greeny WordPress theme contains a critical security vulnerability that allows object injection through the deserialization of untrusted data. The National Vulnerability Database (NVD) has assigned CVE-2026-93940 a CVSS score of 9.8, marking it as a severe threat to any organization using affected versions of the popular commercial theme.

The risk

The vulnerability exploits CWE-502, a weakness involving the deserialization of untrusted data. According to the NVD record, this flaw permits object injection within the Greeny theme. Attackers can potentially manipulate serialized data streams to execute arbitrary code or compromise server integrity when the application processes these inputs without sufficient validation.

The high severity rating reflects the ease with which an attacker could exploit this flaw. A score of 9.8 indicates that the vulnerability is easily exploitable and could have a devastating impact on confidentiality, integrity, and availability. Organizations must treat this as an urgent operational risk requiring immediate attention.

Who is exposed

The vulnerability affects all iterations of the ThemeREX Group Greeny theme from its initial release through version 2.10.0. Any small business or enterprise deploying these versions on their web infrastructure is directly exposed. Users running older versions are not safe from this specific object injection vector.

Site administrators should verify their current theme version immediately. If the installed version is 2.10.0 or lower, the site is vulnerable. There is no partial mitigation for this specific code path; the entire affected range requires remediation to close the deserialization gap identified by security researchers.

Cost and compliance

The NVD record for CVE-2026-93940 provides technical classification but does not list specific financial impacts or compliance mandates. However, a critical-rated vulnerability can trigger breach notification requirements if exploited. Organizations subject to strict data protection regulations should factor this risk into their current security posture assessments and audit logs.

What to watch

Managers should monitor server logs for unusual serialization patterns or unexpected object creation events. Security teams need to prioritize patching for this specific CVE before attempting other non-critical updates. Continuous scanning should verify that no legacy instances of Greeny remain on public-facing servers.

What to do and how to stay safe: ThemeREX

• Audit your WordPress installations to identify if the Greeny theme is active and check its version number against the affected range.
• Isolate vulnerable sites from public traffic if immediate patching is not possible, reducing the window for potential exploitation.
• Review server logs for signs of unauthorized object injection or anomalous data processing that may indicate active exploitation.
• Once the vendor provides an update, apply the patch immediately and verify the fix resolves the deserialization issue.

Step-by-step guide: Vulnerability Prioritization: Fix What Actually Matters First

General security guidance from the SecOps Signal newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the CVSS score for CVE-2026-93940?

The National Vulnerability Database rates CVE-2026-93940 as critical with a CVSS score of 9.8.

Which versions of the Greeny theme are affected by this vulnerability?

All versions of the ThemeREX Group Greeny theme from the initial release through version 2.10.0 are affected.

What type of security weakness does this CVE represent?

The vulnerability is classified as CWE-502, which is the deserialization of untrusted data, allowing object injection.