CVE-2026-9016: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-mqgx-5f5c-w96h
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CVSS 5.3
CWE-117
Published
Advisory Summary

CVE-2026-9016 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-117: Improper Output Neutralization for Logs) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-9016 at a Glance

CVE Identifier CVE-2026-9016
GHSA Identifier GHSA-mqgx-5f5c-w96h
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-117: Improper Output Neutralization for Logs
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-2026-9016

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-2026-9016, 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-117: Improper Output Neutralization for Logs, where the product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file. 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

The Debug Log Manager – Conveniently Monitor and Inspect Errors plugin for WordPress is vulnerable to Improper Output Neutralization for Logs in all versions up to, and including, 2.5.0. This is due to the `log_js_errors()` AJAX handler being registered for unauthenticated users via `wp_ajax_nopriv_log_js_errors` and gated only by a nonce that is publicly disclosed in every front-end page's HTML through `wp_localize_script()` whenever JavaScript error logging is enabled, providing no real authorization barrier. This makes it possible for unauthenticated attackers to inject arbitrary forged entries into the site's WordPress debug log by supplying attacker-controlled values for the `message`, `script`, `lineNo`, `columnNo`, and `pageUrl` fields — enabling spoofing of error and incident records, obscuring malicious activity within fabricated log noise, and misleading administrators who rely on the log for triage. This vulnerability is only exploitable when the plugin's JavaScript error logging feature is enabled, as the requisite nonce is only published into the page HTML under that condition.

References

NVD — CVE-2026-9016 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9016
plugins.trac.wordpress.org/browser/debug-log-m... WEB
https://plugins.trac.wordpress.org/browser/debug-log-manager/tags/2.4.3/bootstrap.php#L123
plugins.trac.wordpress.org/browser/debug-log-m... WEB
https://plugins.trac.wordpress.org/browser/debug-log-manager/tags/2.4.3/bootstrap.php#L556
plugins.trac.wordpress.org/browser/debug-log-m... WEB
https://plugins.trac.wordpress.org/browser/debug-log-manager/tags/2.4.3/classes/class-debug-log.php#L1947
plugins.trac.wordpress.org/browser/debug-log-m... WEB
https://plugins.trac.wordpress.org/browser/debug-log-manager/tags/2.4.3/classes/class-debug-log.php#L1961
plugins.trac.wordpress.org/changeset WEB
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3543321%40debug-log-manager&new=3543321%40debug-log-manager&sfp_email=&sfph_mail=
www.wordfence.com/threat-intel/vulner... WEB
https://www.wordfence.com/threat-intel/vulnerabilities/id/25abca87-1be2-427e-ab01-377d52917052?source=cve

Frequently Asked Questions

What is CVE-2026-9016?
CVE-2026-9016 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-117: Improper Output Neutralization for Logs.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-9016?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-9016?
CVE-2026-9016 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-2026-9016?
CVE-2026-9016 is classified under CWE-117: Improper Output Neutralization for Logs (The product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file.).
How can I check Maven dependencies for CVE-2026-9016?
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 
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  "id" : "GHSA-mqgx-5f5c-w96h",
  "modified" : "2026-06-06T06:30:29Z",
  "published" : "2026-06-06T06:30:29Z",
  "aliases" : [ "CVE-2026-9016" ],
  "details" : "The Debug Log Manager – Conveniently Monitor and Inspect Errors plugin for WordPress is vulnerable to Improper Output Neutralization for Logs in all versions up to, and including, 2.5.0. This is due to the `log_js_errors()` AJAX handler being registered for unauthenticated users via `wp_ajax_nopriv_log_js_errors` and gated only by a nonce that is publicly disclosed in every front-end page's HTML through `wp_localize_script()` whenever JavaScript error logging is enabled, providing no real authorization barrier. This makes it possible for unauthenticated attackers to inject arbitrary forged entries into the site's WordPress debug log by supplying attacker-controlled values for the `message`, `script`, `lineNo`, `columnNo`, and `pageUrl` fields — enabling spoofing of error and incident records, obscuring malicious activity within fabricated log noise, and misleading administrators who rely on the log for triage. This vulnerability is only exploitable when the plugin's JavaScript error logging feature is enabled, as the requisite nonce is only published into the page HTML under that condition.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
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    "type" : "ADVISORY",
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    "url" : "https://plugins.trac.wordpress.org/browser/debug-log-manager/tags/2.4.3/bootstrap.php#L556"
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  }, {
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  "database_specific" : {
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    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-06T05:16:29Z"
  }
}