ThemeREX Greeny Object Injection Bug Affects All Versions to 2.10.0 With 9.8 CVSS Score
A critical vulnerability in the ThemeREX Greeny WordPress theme allows object injection through untrusted data deserialization in versions up to 2.10.0.
Key points
- CVE-2026-93940 carries a CVSS score of 9.8, indicating a critical severity rating for remote exploitation.
- The flaw stems from CWE-502, where the application fails to properly validate deserialized data before processing it.
- All versions of the Greeny theme from its initial release through version 2.10.0 are affected by this object injection issue.
ThemeREX Group’s Greeny WordPress theme contains a critical deserialization vulnerability that permits object injection. The National Vulnerability Database records this issue as CVE-2026-93940 with a maximum CVSS score of 9.8. Security teams must assess their environments immediately, as the flaw affects all versions of the theme up to and including 2.10.0. This high-severity finding requires urgent attention from organisations using the theme on public-facing web servers.
Root cause
The underlying technical issue is classified as CWE-502, which involves the deserialization of untrusted data. According to the NVD record, the Greeny theme processes incoming data without adequate validation or sanitisation. This lack of verification allows an attacker to supply malformed data that the application interprets as legitimate objects. Consequently, the system executes arbitrary code or manipulates application state based on the injected object properties.
Attack path
Exploitation of CVE-2026-93940 relies on the application’s handling of serialized data streams. An attacker sends a crafted payload containing malicious object definitions to a vulnerable endpoint within the Greeny theme. The theme then deserialises this input, trusting it to be safe. Because the application does not restrict the classes or methods that can be instantiated during this process, the attacker achieves object injection. This can lead to remote code execution or other severe impacts on the host system.
Affected versions
The vulnerability impacts a wide range of theme versions. According to the NVD advisory, the issue is present in:
- ThemeREX Group Greeny version 2.10.0
- All previous versions of the Greeny theme
- The initial release through version 2.10.0
Mitigation
No vendor patch or security update has been confirmed yet for CVE-2026-93940. Organisations should monitor official channels from ThemeREX Group for a fix. Until an update is available, consider restricting access to affected endpoints or temporarily disabling the theme if it is not actively required for critical business operations.
What to do and how to stay safe: ThemeREX
- Audit your WordPress installations to identify any sites running the ThemeREX Greeny theme in versions 2.10.0 or lower.
- Monitor server logs for unusual deserialization errors or unexpected object instantiation attempts that may indicate exploitation.
- Review firewall rules to restrict access to administrative endpoints and sensitive theme functionality from untrusted IP ranges.
- Prepare a contingency plan to disable the theme or switch to a secure alternative once the vendor provides an update.
General security guidance from the Firewall Pulse 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 assigns a CVSS score of 9.8 to this vulnerability, rating it as critical.
Which versions of the Greeny theme are affected?
All versions of the ThemeREX Group Greeny theme from its initial release through version 2.10.0 are affected.
Is there a fix available for this deserialization flaw?
No fix has been confirmed yet; users must wait for a vendor-provided update or apply temporary mitigations.
