Newsletters Plugin up to 4.15 on WordPress deserialization

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k1.68

Summaryinfo

A vulnerability marked as critical has been reported in Newsletters Plugin up to 4.15. Impacted is an unknown function. This manipulation causes deserialization. The identification of this vulnerability is CVE-2026-16267. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Newsletters Plugin up to 4.15 and classified as critical. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at wpscan.com. This vulnerability is known as CVE-2026-16267 since 07/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 4.16 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Deserialization
CWE: CWE-502 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Newsletters Plugin 4.16

Timelineinfo

07/20/2026 CVE reserved
08/08/2026 +19 days Advisory disclosed
08/08/2026 +0 days VulDB entry created
08/08/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: wpscan.com
Status: Confirmed

CVE: CVE-2026-16267 (🔒)
GCVE (CVE): GCVE-0-2026-16267
GCVE (VulDB): GCVE-100-387139

Entryinfo

Created: 08/08/2026 08:42
Changes: 08/08/2026 08:42 (54)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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