CVE-2026-91827

Description

The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed plugin or theme, this can lead to actions such as arbitrary file operations or remote code execution.

Overview

State: PUBLISHED
Assigner (CNA): WPScan
CVSS severity: HIGH
CVSS score: 7.5 / 10
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Effective score: 7.5 / 10 HIGH source: CNA overview
CWE(s): CWE-502 Deserialization of Untrusted Data
Reserved: 2026-09-15
Published: 2026-09-22 06:58 UTC
Last updated: 2026-09-22 10:05 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/91xxx/CVE-2026-91827.json
Linked Threat: CVE-2026-91827 — Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 07:16:31 UTC
NVD last modified: 2026-09-22 19:41:38 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: contact@wpscan.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore: 1.6 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0030 (probability of exploitation in next 30 days)
EPSS percentile: 23.40% vs all CVEs — higher = more likely to be exploited, as of 2026-09-22

NVD-assigned CWE(s): CWE-502 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84283
Assigner: WPScan
Published: Sep 22, 2026, 6:58:01 AM
Updated: Sep 22, 2026, 10:05:56 AM
EUVD base score (CVSS 3.1): 7.5 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.3000
Vendors: Unknown
Products: Ninja Forms (3.15.3 <3.15.4)
Aliases: GHSA-jvgp-rj42-qjww

ENISA description: The Ninja Forms WordPress plugin 3.15.3 does not prevent user-submitted form field values from being deserialised when an administrator later exports form submissions to CSV, allowing unauthenticated attackers to perform PHP Object Injection; if a suitable POP chain is present via another installed plugin or theme, this can lead to actions such as arbitrary file operations or remote code execution.

EUVD references (1)

https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/

Affected products (1)

Vendor	Product	Versions	Platforms
Unknown	Ninja Forms	`3.15.3` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/ exploitvdb-entrytechnical-description

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://wpscan.com/vulnerability/7b279db2-92e0-4122-b5c6-aa12b7b01858/ contact@wpscan.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-91827 | Vulnerability Database | Aqua Security

web:avd.aquasec.com

CVE-2026-91827 Vulnerability, Severity 0 N/A, Deserialization of Untrusted Data

2026-09-23 15:14 UTC
Patch Management and Mitigation Supported Product Versions

web:docs.qualys.com

Supported Product Versions and Operating Systems Learn more about the products and operating system versions that are supported for Qualys Patch Management and Mitigation . Supported Windows Products Supported Windows Operating Systems Supported Linux Operating Systems Supported Mac Products

2026-09-23 15:14 UTC
GitHub - secureIT-project/CVEfixes: CVEfixes: Automated Collection of ...

web:github.com

CVEfixes: Automated Collection of Vulnerabilities and Their Fixes from Open-Source Software - secureIT-project/CVEfixes

2026-09-23 15:14 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:14 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-23 15:14 UTC
Exploited BIG-IP APM Vulnerability CVE-2026-94127 Fixed

web:securityonline.info

An exploited BIG-IP APM vulnerability tracked as CVE - 2026 -94127 allows RCE attacks. Secure your BIG-IP APM vulnerability deployments with new F5 hotfixes.

2026-09-23 15:14 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:14 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-09-23 15:14 UTC
CVE-2026-62878: Patch Windows DNS Server RCE Flaw

web:windowsforum.com

Microsoft published CVE - 2026 -62878 on August 11 as a Windows DNS Server Remote Code Execution Vulnerability, putting systems that run the Windows DNS Server role into the immediate patch -and-verify queue.

2026-09-23 15:14 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:14 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-91827.json.

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