Is CVE-2026-91827 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-91827?

CVE-2026-91827 has a CVSS v3 severity of HIGH (7.5).

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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.