Auth bypass in Email Subscribers & Newsletters

CVE-2026-83555

The Email Subscribers & Newsletters WordPress plugin before 5.9.35 does not verify the per-subscriber management token before changing a subscriber's subscription status, allowing unauthenticated users to force-unsubscribe or force-confirm an arbitrary subscriber whose email address they know.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-83555: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

  • Email Subscribers & Newsletters

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-83555?
CVE-2026-83555 is a medium-severity vulnerability in Email Subscribers & Newsletters, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-09-23.
How severe is CVE-2026-83555?
Medium severity. CVSS v3 base score is 5.3 out of 10.