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    CVE-2026-91827

    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.

    Published:Sep 22, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 22, 2026
    EPSS Score:
    CVSS Score:7.5

    Affected Products

    Vendor
    Ninjaforms
    Product
    Ninja Forms
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    Related CVEs

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    CVE-2026-15256 (CVSS 4.8) — The Ninja Forms WordPress plugin before 3.14.10 does not prevent user-supplied query-string input, used to pre…
    CVE-2026-65052 (CVSS 8.7) — Ninja Forms WordPress plugin version 3.14.8 and prior contains an improper input validation vulnerability that…
    CVE-2026-65051 (CVSS 6.9) — Ninja Forms WordPress plugin version 3.14.8 contains a client-side enforcement of server-side security vulnera…
    CVE-2026-65050 (CVSS 7.1) — Ninja Forms WordPress plugin version 3.14.8 and prior contains a missing authorization vulnerability in the re…
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    CVE-2026-65048 (CVSS 9.3) — Ninja Forms plugin for WordPress versions 3.10.4 through 3.14.9 contains an unauthenticated stored cross-site …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High