CVE-2026-103475: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-92vv-q57x-j4vj
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CVSS 9.1
CWE-489
Published
Advisory Summary

CVE-2026-103475 is a CRITICAL (CVSS 9.1) security vulnerability vulnerability (CWE-489: Active Debug Code) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product is released with debugging code still enabled or active.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-103475 at a Glance

CVE Identifier CVE-2026-103475
GHSA Identifier GHSA-92vv-q57x-j4vj
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-489: Active Debug Code
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-103475

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-2026-103475, 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-489: Active Debug Code, where the product is released with debugging code still enabled or active. 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

yii2-starter-kit through 4.2.0 exposes the Yii debug and Gii modules to all IP addresses by setting allowedIPs to ['*'] in its default development configuration. Unauthenticated remote attackers can access the debug endpoint to read sensitive data including session cookies and database queries, or access the Gii endpoint to generate and write PHP files into the application directory.

References

NVD — CVE-2026-103475 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103475
Software Source Repository REPOSITORY
https://github.com/yii-starter-kit/yii2-starter-kit/issues/797
Software Source Repository REPOSITORY
https://github.com/yii-starter-kit/yii2-starter-kit
Software Source Repository REPOSITORY
https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/common/config/web.php#L21
www.vulncheck.com/advisories/yii2-sta... WEB
https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-debug-and-gii-module-exposure

Frequently Asked Questions

What is CVE-2026-103475?
CVE-2026-103475 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-489: Active Debug Code.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-103475?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-103475?
CVE-2026-103475 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-103475?
CVE-2026-103475 is classified under CWE-489: Active Debug Code (The product is released with debugging code still enabled or active.).
How can I check Maven dependencies for CVE-2026-103475?
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-92vv-q57x-j4vj",
  "modified" : "2026-09-30T18:33:51Z",
  "published" : "2026-09-30T18:33:51Z",
  "aliases" : [ "CVE-2026-103475" ],
  "details" : "yii2-starter-kit through 4.2.0 exposes the Yii debug and Gii modules to all IP addresses by setting allowedIPs to ['*'] in its default development configuration. Unauthenticated remote attackers can access the debug endpoint to read sensitive data including session cookies and database queries, or access the Gii endpoint to generate and write PHP files into the application directory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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-2026-103475"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yii-starter-kit/yii2-starter-kit/issues/797"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yii-starter-kit/yii2-starter-kit"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/common/config/web.php#L21"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-debug-and-gii-module-exposure"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-489" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-30T18:18:17Z"
  }
}