What is CVE-2026-17520?

CVE-2026-17520 is a medium-severity vulnerability in Newsletters, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2026-08-29.

How severe is CVE-2026-17520?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Newsletters

CVE-2026-17520

The Newsletters WordPress plugin before 4.17 does not generate its API key using a sufficiently random source, deriving it from a publicly known value, allowing unauthenticated attackers to compute the key and perform privileged actions such as adding and deleting subscribers and sending emails, when the optional API has been enabled.

EPSS: 0.001 (0.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Unknown Newsletters

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

References

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

Frequently asked questions

What is CVE-2026-17520?: CVE-2026-17520 is a medium-severity vulnerability in Newsletters, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2026-08-29.
How severe is CVE-2026-17520?: Medium severity. CVSS v3 base score is 4.8 out of 10.