Live Exposure Defense: From CVE to Confirmed Exposure in 12 Hours – See more

Back
New CVE Detected

CVE-2026-84434 – Unauthenticated Arbitrary File Upload / Potential RCE – Gravity Forms ≤ 3.1.0.4

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-84434 is a critical arbitrary file upload vulnerability (CWE-434) in the Gravity Forms WordPress plugin, affecting all versions up to and including 3.1.0.4. The flaw allows unauthenticated attackers to bypass file-extension validation on Hidden File Upload fields and upload potentially executable files to a public-facing WordPress site, which can lead to remote code execution. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: A mismatch between the plugin’s field validation logic and its file persistence pipeline in the upload_file function. When a file is rejected during validation, its upload state is not cleared, and the file is later processed by the upload handler without being re-validated.
  • Trigger conditions: The vulnerability requires a publicly accessible Gravity Forms form that contains a File Upload field with its Visibility setting configured to "Hidden."
  • Attack vector: Network-based (AV:N), requires no authentication (PR:N) and no user interaction (UI:N), with low attack complexity (AC:L), making it exploitable directly against internet-facing WordPress sites.
  • Impact: Successful exploitation allows an unauthenticated attacker to upload arbitrary, potentially executable files to the server, which can result in remote code execution and full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H).

Affected software

  • Gravity Forms (WordPress plugin) — all versions up to and including 3.1.0.4

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update Gravity Forms to the latest available version. The vendor has released newer builds (3.1.1 and 3.1.2) that include general "security enhancements," though the changelog does not attribute a specific fix to this CVE; applying the latest available update is the recommended path to remediation.
  • If immediate patching is not possible:
    • Audit all public-facing forms for File Upload fields configured with Hidden visibility and disable or remove them until the plugin is updated.
    • Restrict or monitor access to the WordPress uploads/temporary upload directories used by Gravity Forms.
    • Configure the web server to prevent execution of scripts (e.g., .php) from upload directories as a defense-in-depth measure.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report

How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
Close

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge