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PatchSiren cyber security CVE debrief

CVE-2026-81784 Marcin CVE debrief

A Deserialization of Untrusted Data vulnerability in the Wise Chat plugin for WordPress, specifically affecting versions from n/a through 3.4.2, has been identified. This issue allows for Object Injection, posing a significant risk to affected systems. The vulnerability has a CVSS score of 8.1 and is classified as HIGH severity. Defenders should assess exposure and prioritize remediation to prevent potential Object Injection attacks, which could lead to data compromise or unauthorized access.

Vendor
Marcin
Product
Wise Chat
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-10
Original CVE updated
2026-10-06
Advisory published
2026-09-10
Advisory updated
2026-10-06

Who should care

Defenders responsible for WordPress installations with the Wise Chat plugin should assess exposure and prioritize remediation to prevent potential Object Injection attacks. This includes verifying plugin versions, applying vendor remediation, and reviewing compensating controls for exposed systems.

Why it matters

CVE-2026-81784 is a Deserialization of Untrusted Data vulnerability in the Wise Chat plugin for WordPress, posing a significant risk to affected systems. Defenders should prioritize verifying exposure and applying remediation.

  • Potential for Object Injection, allowing attackers to manipulate data.
  • Risk of data compromise or unauthorized access.
  • Need for verification of plugin versions and application of remediation.

Technical summary

The Wise Chat plugin for WordPress, versions from n/a through 3.4.2, is vulnerable to Deserialization of Untrusted Data, allowing for Object Injection. This issue has a CVSS score of 8.1 and is classified as HIGH severity. The vulnerability poses a significant risk to affected systems, and defenders should prioritize verifying exposure and applying vendor remediation.

Defensive priority

Defenders should prioritize verifying exposure of Wise Chat plugin versions and applying vendor remediation.

Recommended defensive actions

  • Verify exposure of Wise Chat plugin versions and apply vendor remediation.
  • Review and update inventory of WordPress installations with Wise Chat plugin.
  • Monitor for potential exploitation attempts.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.1 and severity classification as HIGH. The Wise Chat plugin for WordPress, versions from n/a through 3.4.2, is vulnerable to Deserialization of Untrusted Data, allowing for Object Injection. This information is based on the official CVE Program record and the NIST NVD detail page.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-81784 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-81784

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-81784 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-81784

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.