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Wise Chat EUVDEUVD-2026-75517

| CVE-2026-81784 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-09-10 Patchstack GHSA-xxr7-8h46-rxxw
8.1
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) 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

AC:H correctly captures the mandatory POP gadget chain requirement; PR:N confirmed unauthenticated; full C/I/A impact reflects realistic worst-case for successful PHP Object Injection.

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

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

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

Lifecycle Timeline

2
Analysis Generated
Sep 10, 2026 - 15:16 vuln.today
CVE Published
Sep 10, 2026 - 14:23 cve.org
HIGH 8.1

DescriptionCVE.org

Unauthenticated PHP Object Injection in Wise Chat <= 3.4 versions.

AnalysisAI

Unauthenticated PHP Object Injection in Wise Chat WordPress plugin versions up to and including 3.4 allows a remote attacker to achieve high-impact compromise of confidentiality, integrity, and availability by passing crafted serialized data to an unprotected deserialization point. Exploitation requires a viable POP gadget chain within the target WordPress environment, keeping the practical bar elevated despite requiring no credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Install
technique details hidden
C2
technique details hidden
Execute
technique details hidden
Impact
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Vulnerability AssessmentAI

Exploitation The attacker must reach a Wise Chat endpoint that deserializes user-supplied input; no authentication is required (PR:N) and no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.1 score with AC:H accurately reflects that successful exploitation is gated on gadget chain availability, which varies by hosting environment and installed plugins. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The exact fixed version is not stated in the available data and should be confirmed by consulting the Patchstack advisory and the WordPress.org plugin changelog for Wise Chat. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, audit all systems for Wise Chat plugin versions 3.4 and below and immediately disable the plugin if not operationally critical. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-75517 vulnerability details – vuln.today

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