CVE-2026-17520: Weak Crypto (CVSS 4.8)

Description

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.

Is your site exposed to CVE-2026-17520?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.8

MEDIUM

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

EPSS — Exploit Prediction

0.0012

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-326 CWE-326

References

Other References

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2026-17520? +

CVE-2026-17520 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0012, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-17520? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-21881

Inadequate Encryption Strength vulnerability allow an authenticated attacker to execute arbitrary OS Commands via encrypted package upload.This issue affects Envoy: …

CVE-2025-46833

Programs/P73_SimplePythonEncryption.py illustrates a simple Python encryption example using the RSA Algorithm. In versions prior to commit 6ce60b1, an attacker may …

CVE-2025-2516

The use of a weak cryptographic key pair in the signature verification process in WPS Office (Kingsoft) on Windows allows …

CVE-2024-13026

A vulnerability exists in Algo Edge up to 2.1.1 - a previously used (legacy) component of navify® Algorithm Suite. The …

CVE-2026-49852

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to …

CVE-2026-4648

Use of an insecure cryptographic algorithm in the cashless payment system using NFC wristbands from CasfID Servicios Tecnológicos S.L.U. (version …

CVE-2026-17520