EUVD-2026-43627
GHSA-cxqr-jhpf-63mm
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable, unauthenticated public form (AV:N/PR:N/UI:N); AC:H because a version-specific POP payload must be crafted; deserialization RCE yields full C/I/A impact.
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
Lifecycle Timeline
5DescriptionCVE.org
The Newsletters WordPress plugin before 4.15 does not prevent deserialization of untrusted input that is stored through a public form, allowing unauthenticated attackers to inject a PHP object and, via a property-oriented gadget chain bundled with the Newsletters WordPress plugin before 4.15, write arbitrary files and execute code on the server.
AnalysisAI
Unauthenticated PHP object injection in the Newsletters WordPress plugin before 4.15 lets remote attackers deserialize attacker-controlled data submitted through a public-facing form, then leverage a property-oriented gadget chain bundled inside the plugin itself to write arbitrary files and achieve remote code execution on the host. Publicly available exploit code exists (published via WPScan), though there is no public exploit identified as being used in active attacks and the flaw is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target run the Newsletters plugin at a version before 4.15 and that the plugin's public-facing form (the subscriber/subscription input handler) be reachable and accepting submissions - this is the default deployment state for a plugin whose purpose is public newsletter sign-up. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H (8.1, High) reflects a network-reachable, unauthenticated (PR:N) flaw with no user interaction but high attack complexity (AC:H) and full CIA impact - consistent with a deserialization RCE where crafting/aligning the object payload against a specific plugin version is non-trivial. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker locates a WordPress site running Newsletters below 4.15, then submits a crafted serialized PHP object through the plugin's public subscription form with no account or authentication required. When the server deserializes the input, the plugin's bundled gadget chain fires, writing a PHP webshell into the webroot and yielding remote code execution; a public POC for this exact flow is available via WPScan, lowering the practical difficulty despite the CVSS AC:H rating. |
| Remediation | Vendor-released patch: version 4.15 - upgrade the Newsletters plugin to 4.15 or later immediately, as the fix eliminates the unsafe deserialization of public form input. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all WordPress installations using Newsletters plugin versions prior to 4.15 and assess whether the plugin is actively deployed with public form access enabled. …
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External POC / Exploit Code
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