CVE-2026-16267

Newsletters < 4.16 - Unauthenticated PHP Object Injection via Date Form Field

Published Aug 8, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
The Newsletters WordPress plugin before 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Wordpress-extensions
Wordpress-extensions newsletters
Vendors & Products Wordpress-extensions
Wordpress-extensions newsletters
Type Values Removed Values Added
Weaknesses CWE-545
Type Values Removed Values Added
Weaknesses CWE-502
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-545
Type Values Removed Values Added
Description The Newsletters WordPress plugin before 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.
Title Newsletters < 4.16 - Unauthenticated PHP Object Injection via Date Form Field
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Aug 11, 2026, 7:32 PM
Reserved
Jul 20, 2026, 9:09 AM
Status
Deferred
Published
Aug 8, 2026, 7:17 AM
Modified
Aug 26, 2026, 4:31 PM