CVE-2025-66055 WordPress Email Subscribers & Newsletters plugin <= 5.9.10 - PHP Object Injection vulnerability
An attacker can exploit PHP object injection in the Email Subscribers & Newsletters plugin to potentially execute arbitrary code on the WordPress site.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66055?
CVE-2025-66055 is a high-severity unsafe deserialization vulnerability in Icegram Email Subscribers & Newsletters, published on 21 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Deserialization of Untrusted Data vulnerability in Icegram Email Subscribers & Newsletters email-subscribers allows Object Injection.This issue affects Email Subscribers & Newsletters: from n/a through <= 5.9.10.
Weakness: CWE-502
Which versions are affected by CVE-2025-66055?
How do I fix CVE-2025-66055?
No fix has been published for CVE-2025-66055 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-66055 being exploited?
There is no known exploitation of CVE-2025-66055 in the wild and no public exploit code.
Sources
Also known as GHSA-96qq-9955-wf6g.