Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export (CVE-2026-91827) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-91827

Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export

Answer in brief

CVE-2026-91827 records a Unknown severity vulnerability in Ninja Forms 3.15.3 - Unauthenticated PHP Object Injection via CSV Export. The current sources do not mark it as known exploited. The current feed maps Unknown/Ninja Forms (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Ninja Forms (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Ninja Formsgeneric	>=3.15.3 <3.15.4	3.15.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Ninja Forms.
Review the reported fix. Update Unknown/Ninja Forms to 3.15.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.