CVE-2026-17520

Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key

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.

Affected

Newsletters

CVSS v3.1 CNA

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

EPSS

0.12% chance of exploitation in the next 30 days, 2nd percentile

Published

2026-08-29

Updated

2026-08-30

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/5a719e6b-22e1-4950-bf17-cd92e2ea6685/

References

• CVE Record
• NVD entry