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Newsletters Plugin EUVDEUVD-2026-54729

| CVE-2026-16267 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-08-08 WPScan GHSA-jxc3-pfg8-hv86
Deserialization PHP WordPress Newsletters
8.1
CVSS 3.1 · Vendor: WPScan
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Severity by source

Vendor (WPScan) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

Network-accessible public form with no auth, but AC:H reflects mandatory gadget-chain prerequisite; full C/I/A impact if chain is present.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (WPScan).

CVSS VectorVendor: WPScan

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 11, 2026 - 20:56 vuln.today
CVSS changed
Aug 11, 2026 - 20:22 NVD
8.1 (HIGH)
Patch available
Aug 08, 2026 - 07:01 EUVD
CVE Published
Aug 08, 2026 - 06:00 cve.org
HIGH 8.1
CVE Published
Aug 08, 2026 - 06:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

PHP object injection in the Newsletters WordPress plugin (all versions before 4.16) permits unauthenticated remote attackers to supply arbitrary serialized PHP objects through a public-facing form, bypassing class restrictions entirely. If a suitable PHP gadget chain is present in the WordPress environment - commonly introduced by co-installed plugins or PHP libraries - this can escalate to remote code execution, data exfiltration, or full site compromise. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Identify WordPress site running Newsletters plugin pre-4.16
Delivery
Enumerate co-installed plugins for gadget-chain candidates
Exploit
Craft serialized PHP object payload using available chain
Install
Submit payload via unauthenticated public Newsletters form
C2
PHP unserialize() instantiates injected object class
Execute
Gadget chain magic methods trigger
Impact
Execute arbitrary code as web server process
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Vulnerability AssessmentAI

Exploitation The Newsletters WordPress plugin must be installed, active, and at a version below 4.16 on the target site. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, score 8.1) captures the core tension: the attack is fully network-accessible and requires no authentication or user interaction, but AC:H honestly reflects the prerequisite of a usable PHP gadget chain in the target environment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker enumerates a WordPress site and confirms the Newsletters plugin is active and pre-4.16. Using the publicly available PoC referenced by WPScan, the attacker crafts a serialized PHP payload embedding a gadget chain drawn from another installed plugin (e.g., a widely-used utility library) and submits it via the plugin's public subscription form. …
Remediation Update the Newsletters WordPress plugin to version 4.16 or later, which introduces class restrictions on deserialization of form-submitted values. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all WordPress installations to identify those running Newsletters plugin versions below 4.16; prioritize assessment of customer-facing and business-critical instances. …

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EUVD-2026-54729 vulnerability details – vuln.today
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