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CVE-2026-91827

Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91827

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91827

Published

Ninja Forms

https://wordpress.org/plugins

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Unknown",
                    "product": "Ninja Forms",
                    "versions": [
                        {
                            "status": "affected",
                            "versionType": "semver",
                            "version": "3.15.3",
                            "lessThan": "3.15.4"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "collectionURL": "https://wordpress.org/plugins"
                }

Original source record · Cite this exact observation · Complete original publisher JSON