EUVD-2026-66946
GHSA-j565-hhqc-8rx3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated remote deserialization with low complexity (AV:N/AC:L/PR:N/UI:N); PHP object injection can yield code execution, so C/I/A all High.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in Hash Form <= 1.4.1 versions.
Articles & Coverage 1
AnalysisAI
PHP Object Injection in the Hash Form WordPress plugin (versions 1.4.1 and earlier) lets remote, unauthenticated attackers inject crafted serialized objects that are deserialized by the plugin, enabling code execution, data tampering, or site compromise depending on available gadget chains. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) rates it 9.8 Critical with no authentication required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target runs Hash Form version 1.4.1 or earlier and that an attacker can reach the plugin's input-processing endpoint over the network - no authentication and no user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuinely high-priority issue rather than an inflated CVSS: the vector is fully remote and unauthenticated (AV:N/AC:L/PR:N/UI:N) with high impact across confidentiality, integrity, and availability, and the vulnerability class (PHP object injection) is a well-understood, reliably weaponizable primitive on WordPress. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a crafted, unauthenticated HTTP request to a Hash Form endpoint with a parameter containing a serialized PHP object payload. The plugin deserializes the input, instantiating an attacker-chosen object whose magic methods trigger a gadget chain in WordPress or another installed component, leading to actions such as arbitrary file write or code execution. … |
| Remediation | No vendor-released patch version is identified in the provided data; the input confirms only that versions up to and including 1.4.1 are vulnerable. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all WordPress installations running Hash Form plugin versions 1.4.1 and earlier and immediately deactivate the plugin via WordPress admin dashboard to prevent exploitation. …
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View allSame technique Deserialization
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External POC / Exploit Code
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