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CVE-2026-110899 Kevin Stover CVE debrief

The CVE-2026-110899 vulnerability is a Cross-Site Scripting (XSS) issue in the WordPress Ninja Forms plugin, affecting versions up to 3.15.5. This vulnerability allows for Stored XSS, which can be exploited by an attacker to inject malicious scripts into web pages. The vulnerability has a CVSS score of 7.1 and is considered HIGH severity. Defenders and administrators of WordPress environments using the Ninja Forms plugin should be aware of this vulnerability and take necessary actions to patch or mitigate it. The CVE Program and NVD records confirm the vulnerability, and the fix is available in version 3.15.6.

Vendor
Kevin Stover
Product
Ninja Forms
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-21
Original CVE updated
2026-10-30
Advisory published
2026-10-21
Advisory updated
2026-10-30

Who should care

Defenders and administrators of WordPress environments using the Ninja Forms plugin should be aware of this vulnerability and take necessary actions to patch or mitigate it.

Why it matters

The CVE-2026-110899 vulnerability in the WordPress Ninja Forms plugin requires attention from defenders and administrators to prevent potential XSS attacks.

  • Potential injection of malicious scripts into web pages
  • Possible security issues due to Stored XSS vulnerability
  • Need for patching or mitigation to prevent exploitation

Technical summary

The CVE-2026-110899 vulnerability is a Stored XSS issue in the WordPress Ninja Forms plugin, affecting versions up to 3.15.5. The vulnerability allows an attacker to inject malicious scripts into web pages, potentially leading to security issues. The CVE Program and NVD records provide source-grounded technical framing for this vulnerability. Defenders should prioritize patching or mitigating this vulnerability, especially in environments where the Ninja Forms plugin is used, to prevent potential XSS attacks.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where the Ninja Forms plugin is used, to prevent potential XSS attacks.

Recommended defensive actions

  • Patch or upgrade the Ninja Forms plugin to version 3.15.6 or later
  • Implement additional security measures to detect and prevent XSS attacks
  • Monitor web application logs for suspicious activity

Evidence notes

The vulnerability is confirmed by the CVE Program and NVD records. The affected version is up to 3.15.5, and the fix is available in version 3.15.6. The evidence is based on official CVE metadata and NIST NVD vulnerability assessment. Defenders should verify the affected scope and severity, and review compensating controls for exposed systems while remediation is scheduled and verified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-110899 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-110899

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

  • CVE-2026-110899 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-110899

    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.