What is CVE-2026-16267?

CVE-2026-16267 is a high-severity vulnerability in Newsletters, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-08-08.

How severe is CVE-2026-16267?

High severity. CVSS v3 base score is 8.1 out of 10.

Deserialization in Newsletters

CVE-2026-16267

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.003 (19.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Unknown Newsletters — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-16267?: CVE-2026-16267 is a high-severity vulnerability in Newsletters, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-08-08.
How severe is CVE-2026-16267?: High severity. CVSS v3 base score is 8.1 out of 10.