CVE-2026-91827

Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export

HIGH

7.5

CVSS Score

Published: September 22, 2026 at 06:58 AM UTC

Updated: September 22, 2026 at 08:01 PM UTC

1 product affected across 1 vendorNinjaforms

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Severity

HIGH7.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ninjaforms · Ninjaformswordpress-plugin

60%

3.15.3 ≤ v < 3.15.43.15.3

Affected range stops below 3.15.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

ExploitVDB EntryTechnical Description

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHWPScan

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-502

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