CVE-2026-16267
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductNewsletters
PublishedAug 8, 2026
First seenAug 8, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- Newsletters4.16 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Newsletters | v < 4.16 | 4.16 |
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