Auth bypass in Newsletters
CVE-2026-16264
The Newsletters WordPress plugin before 4.18.1 does not perform an ownership check on some of its subscriber management actions, and issues a management session to unauthenticated visitors on request, allowing attackers to read any subscriber's personal data and overwrite any subscriber's record including their email address.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
- Newsletters
Weakness classification (CWE)
References
- wpscan.com/vulnerability/0dd1de2d-e9bb-4c42-a78b-2643d43dfed6/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-16264?
- CVE-2026-16264 is a medium-severity vulnerability in Newsletters, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-09-23.
- How severe is CVE-2026-16264?
- Medium severity. CVSS v3 base score is 6.5 out of 10.