Vulnerability · Published Aug 8, 2026 · Assigned by WPScan
CVE-2026-16267Newsletters < 4.16 - Unauthenticated PHP Object Injection via Date Form Field
High 8.1
In plain English
A high-severity unsafe deserialization in Newsletters from Unknown. 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)8.1High
Exploit odds (30 days)0.5%top 60.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The Newsletters WordPress plugin before 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Newsletters | 0 – before 4.16 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://wpscan.com/vulnerability/b51c11d6-5bfa-4b2c-b348-cda19889deee/ exploit, vdb-entry, technical-description