Vulnerability · Published Jan 8, 2026 · Assigned by Patchstack
CVE-2025-67911WordPress Newsletters plugin <= 4.11 - PHP Object Injection vulnerability
Critical 9.8
In plain English
A critical-severity unsafe deserialization in Newsletters from Tribulant Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 60.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Deserialization of Untrusted Data vulnerability in Tribulant Software Newsletters newsletters-lite allows Object Injection.This issue affects Newsletters: from n/a through <= 4.11.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tribulant Software | Newsletters | 0 – through 4.11 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H