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CVE-2023-35909· NVD / CVE Program· CNA Patchstack

WordPress Ninja Forms Plugin <= 3.6.25 is vulnerable to Denial of Service Attack

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.76% (FIRST EPSS); higher than 54.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Saturday Drive Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress 3.6.26.

Low priority for now. Upgrade to Saturday Drive Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress 3.6.26 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Uncontrolled Resource Consumption vulnerability in Saturday Drive Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress leading to DoS.This issue affects Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress: from n/a through 3.6.25.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Dec 7, 2023
Updated
Jun 17, 2026
EPSS
0.7% · 54th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CNA vs NVD score

NVD
5.3
CNA · Patchstack
5.3
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Is Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder on your site?

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Is Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder on your site?

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
ninjaformsninja forms

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ninjaforms ninja formsbefore 3.6.26

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Patchstack). Independent of NVD's CPE analysis and usually ahead of it.

  • Saturday Drive Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress

    • n/a and later · up to and including 3.6.25affectedfixed in 3.6.26

Same product

ninjaforms: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-1209The Ninja Forms plugin before 2.9.42.1 for WordPress allows remote attackers to conduct PHP object injection attacks via crafted serialized
    60This week
  • CVE-2025-9083Ninja-forms < 3.11.1 - Unauthenticated PHP Objection
    39Monitor
  • CVE-2024-37934WordPress Ninja Forms plugin <= 3.8.4 - Subscriber+ Arbitrary Shortcode Execution vulnerability
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2023-37979Jul 27, 2023 · WordPress Ninja Forms Plugin <= 3.6.25 is vulnerable to Cross Site Scripting (XSS)
    27Monitor
  • ← EarlierCVE-2023-5530Nov 6, 2023 · Ninja Forms < 3.6.34 - Admin+ Stored XSS
    19Monitor
  • Later →CVE-2024-0685Feb 2, 2024 · Ninja Forms Contact Form <= 3.7.1 - Unauthenticated Second Order SQL Injection
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Saturday Drive Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress3.6.26Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
Low

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records