CVE-2026-91827 Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export
Unauthenticated attackers can trigger PHP object injection via CSV export, potentially leading to remote code execution or file operations if a suitable gadget chain exists.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-91827?
CVE-2026-91827 is a high-severity unsafe deserialization vulnerability in Unknown Ninja Forms, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-91827?
How do I fix CVE-2026-91827?
No fix has been published for CVE-2026-91827 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-91827 being exploited?
There is no known exploitation of CVE-2026-91827 in the wild and no public exploit code.
Sources
Also known as GHSA-jvgp-rj42-qjww.