CVE-2026-16267 | BDVDB-2026-356394 Detail

Newsletters

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

CWE-502 Deserialization of Untrusted Data

References#

https://wpscan.com/vulnerability/b51c11d6-5bfa-4b2c-b348-cda19889deee/

Exploit#

https://wpscan.com/vulnerability/b51c11d6-5bfa-4b2c-b348-cda19889deee/

History#

Version 12026-08-08Record published in the CVE List.
Version 22026-08-11Most recent update recorded in the CVE List.

Published

Published: 2026-08-08
Last modified: 2026-08-11

Vendor information

Vendor: Not stated
Product: Newsletters

Score

8.1 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 39.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Insecure Deserialization

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 4.16
Fixed
4.16

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.1 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).