Open Redirect in Newsletter

CVE-2026-86823

The Newsletter WordPress plugin before 9.3.7 does not validate the destination of the redirect performed after a public subscription action, allowing unauthenticated attackers to redirect users to arbitrary external sites and to disclose a subscriber token that grants access to that subscriber record's front-end actions.

Vulnerability class: Open Redirect

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:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.3% 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-2026-86823: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Newsletter

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-86823?
CVE-2026-86823 is a medium-severity vulnerability in Newsletter, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.3/10. Published 2026-09-16.
How severe is CVE-2026-86823?
Medium severity. CVSS v3 base score is 5.3 out of 10.