CVE-2026-100306: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-5966-7cgr-qvf4
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CVSS 5.3
CWE-602
Published
Advisory Summary

CVE-2026-100306 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-602: Client-Side Enforcement of Server-Side Security) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-100306 at a Glance

CVE Identifier CVE-2026-100306
GHSA Identifier GHSA-5966-7cgr-qvf4
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-602: Client-Side Enforcement of Server-Side Security
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-100306

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-100306, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-602: Client-Side Enforcement of Server-Side Security, where the product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

TDuck survey form through 6.0 fails to validate write passwords on submission endpoints, enforcing the check only on the front end. Remote unauthenticated attackers can submit form entries directly to public submission APIs without providing the password by using the form key from share links.

References

NVD — CVE-2026-100306 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100306
Software Source Repository REPOSITORY
https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_create_bypass.py
Software Source Repository REPOSITORY
https://github.com/TDuckCloud/tduck-survey-form
Software Source Repository REPOSITORY
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormResultController.java#L152-L172
Software Source Repository REPOSITORY
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormSettingController.java#L154-L162
www.vulncheck.com/advisories/tduck-su... WEB
https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-write-password-bypass-via-client-side-enforcement

Frequently Asked Questions

What is CVE-2026-100306?
CVE-2026-100306 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-602: Client-Side Enforcement of Server-Side Security.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-100306?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-100306?
CVE-2026-100306 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-100306?
CVE-2026-100306 is classified under CWE-602: Client-Side Enforcement of Server-Side Security (The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.).
How can I check Maven dependencies for CVE-2026-100306?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5966-7cgr-qvf4",
  "modified" : "2026-09-25T21:33:00Z",
  "published" : "2026-09-25T21:33:00Z",
  "aliases" : [ "CVE-2026-100306" ],
  "details" : "TDuck survey form through 6.0 fails to validate write passwords on submission endpoints, enforcing the check only on the front end. Remote unauthenticated attackers can submit form entries directly to public submission APIs without providing the password by using the form key from share links.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100306"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_create_bypass.py"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TDuckCloud/tduck-survey-form"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormResultController.java#L152-L172"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormSettingController.java#L154-L162"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-write-password-bypass-via-client-side-enforcement"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-602" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-25T19:16:51Z"
  }
}