Vulnerability · Published Aug 29, 2026 · Assigned by WPScan
CVE-2026-17520Newsletters < 4.17 - Unauthenticated API Access via Predictable API Key
Medium 4.8
In plain English
A medium-severity security flaw in Newsletters from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.2%top 91.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Newsletters | 0 – before 4.17 |
Weakness: CWE-326 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
References
- https://wpscan.com/vulnerability/5a719e6b-22e1-4950-bf17-cd92e2ea6685/ exploit, vdb-entry, technical-description