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PatchSiren cyber security CVE debrief

CVE-2026-106166 NEX-Forms CVE debrief

CVE-2026-106166 is a vulnerability in the NEX-Forms WordPress plugin before version 9.3.1. The vulnerability allows unauthenticated attackers to modify form entries by referencing their sequential identifier, potentially leading to data tampering. This issue arises from the plugin's lack of authorization, ownership, or request-validation checks before updating stored form entries. As a result, attackers can overwrite, permanently erase, reassign, or append to any previously submitted form entry. Defenders should assess exposure and prioritize verification and remediation efforts to prevent potential data tampering.

Vendor
NEX-Forms
Product
NEX-Forms
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for WordPress installations with the NEX-Forms plugin should assess exposure and prioritize verification and remediation efforts to prevent potential data tampering. They should verify the version of NEX-Forms in use and ensure it is updated to 9.3.1 or later. Additionally, they should monitor form entries for suspicious activity and review incident response plans to address potential data tampering.

Why it matters

CVE-2026-106166 is a vulnerability in the NEX-Forms WordPress plugin that allows unauthenticated attackers to modify form entries. Defenders should prioritize verifying the version of NEX-Forms in use and ensuring it is updated to 9.3.1 or later. They should also monitor form entries for any suspicious activity.

  • Potential data tampering due to unauthenticated form entry modification
  • Need to verify NEX-Forms version and update to 9.3.1 or later
  • Monitoring form entries for suspicious activity is crucial

Technical summary

The NEX-Forms WordPress plugin before version 9.3.1 does not perform authorization, ownership, or request-validation checks before updating stored form entries. This allows unauthenticated attackers to overwrite, erase, reassign, or append to previously submitted form entries by referencing their sequential identifier. The vulnerability can lead to data tampering and defenders should prioritize verifying the version of NEX-Forms in use and ensuring it is updated to 9.3.1 or later. They should also monitor form entries for any suspicious activity and review compensating controls for exposed systems while remediation is scheduled and verified.

Defensive priority

Defenders should prioritize verifying the version of NEX-Forms in use and ensuring it is updated to 9.3.1 or later. They should also monitor form entries for any suspicious activity.

Recommended defensive actions

  • Verify the version of NEX-Forms in use and update to 9.3.1 or later
  • Monitor form entries for suspicious activity
  • Review and update incident response plans to address potential data tampering
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record and source item provide details on the vulnerability, but there is limited information on the impact and exploitation. Further verification is required to determine the extent of the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-106166 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-106166

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

  • CVE-2026-106166 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-106166

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

Supplemental references

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.