Vulnerability · Published Sep 17, 2026 · Assigned by WPScan
CVE-2026-86824Newsletter < 9.3.8 - Unauthenticated Subscriber PII Disclosure and Modification via Predictable Tracking Signature Key
Medium 4.8
In plain English
A medium-severity security flaw in Newsletter 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 4% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.2%top 95.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The Newsletter WordPress plugin before 9.3.8 does not generate its email tracking signing key with sufficient entropy and signs its tracking links with an unkeyed hash, allowing an unauthenticated attacker who recovers that key offline to forge tracking links, obtain any subscriber's session token, and read and modify that subscriber's stored personal data.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Newsletter | 0 – before 9.3.8 |
Weakness: CWE-326 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://wpscan.com/vulnerability/62ee25d9-ec38-402c-9959-37fd89708aca/ exploit, vdb-entry, technical-description