CVE-2026-86824: CWE-326 Inadequate Encryption Strength in Newsletter
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.
AI Analysis
Technical Summary
CVE-2026-86824 describes a vulnerability in the Newsletter WordPress plugin prior to version 9.3.8 where the email tracking signing key is generated with inadequate entropy and tracking links are signed using an unkeyed hash. This cryptographic weakness enables an attacker who recovers the signing key offline to forge tracking links, thereby obtaining session tokens of subscribers and reading or modifying their personal data stored by the plugin.
Potential Impact
An attacker who recovers the weakly generated signing key can forge tracking links to impersonate subscribers, gaining access to their session tokens. This access allows reading and modification of subscribers' stored personal data, compromising confidentiality and integrity of user information.
Mitigation Recommendations
Upgrade the Newsletter plugin to version 9.3.8 or later, where this vulnerability has been addressed by improving the entropy used for key generation and securing the signing process of tracking links.
CVE-2026-86824: CWE-326 Inadequate Encryption Strength in Newsletter
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.
CVSS v3.1
Score 4.8medium
Affected software
Newsletter
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86824 describes a vulnerability in the Newsletter WordPress plugin prior to version 9.3.8 where the email tracking signing key is generated with inadequate entropy and tracking links are signed using an unkeyed hash. This cryptographic weakness enables an attacker who recovers the signing key offline to forge tracking links, thereby obtaining session tokens of subscribers and reading or modifying their personal data stored by the plugin.
Potential Impact
An attacker who recovers the weakly generated signing key can forge tracking links to impersonate subscribers, gaining access to their session tokens. This access allows reading and modification of subscribers' stored personal data, compromising confidentiality and integrity of user information.
Mitigation Recommendations
Upgrade the Newsletter plugin to version 9.3.8 or later, where this vulnerability has been addressed by improving the entropy used for key generation and securing the signing process of tracking links.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-08T14:21:27.392Z
- State
- PUBLISHED
Threat ID: 6aab827555bf5e2cf5d4d326
Added to database: 09/17/2026, 06:02:29 UTC
Last enriched: 09/17/2026, 06:17:31 UTC
Last updated: 09/17/2026, 22:12:06 UTC
Views: 7
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