CVE-2026-15964: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-75h6-5h53-j8cq
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CVSS 9.8
CWE-620
Published
Advisory Summary

CVE-2026-15964 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-620: Unverified Password Change) affecting Software libraries in the Maven ecosystem. The weakness occurs when when setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-15964 at a Glance

CVE Identifier CVE-2026-15964
GHSA Identifier GHSA-75h6-5h53-j8cq
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-620: Unverified Password Change
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H).

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 High (A:H)

How to Fix CVE-2026-15964

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-2026-15964, 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-620: Unverified Password Change, where when setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication. 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 Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the `ssoprocess_ajax()` function — registered on `wp_ajax_nopriv_ssoprocess_ajax` and therefore reachable without authentication — accepting an attacker-supplied `email` parameter with the `setnewpassword` operation and calling `reset_password()` on the resolved account without any ownership token, email confirmation link, or capability check. The sole guard is a call to `check_ajax_referer()`, which provides no authorization barrier because the `ssoajaxnonce` nonce is publicly broadcast on every front-end page via `wp_localize_script()` into the `SSOPWDREQUIREMENT` JavaScript object; since WordPress computes nonces for logged-out visitors against a shared anonymous session context, any unauthenticated visitor can scrape a valid nonce from the homepage and use it to authenticate the request. This makes it possible for unauthenticated attackers to change the password of any WordPress account, including administrator accounts, enabling complete site takeover.

References

NVD — CVE-2026-15964 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15964
plugins.trac.wordpress.org/browser/single-sign... WEB
https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L102
plugins.trac.wordpress.org/browser/single-sign... WEB
https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L120
plugins.trac.wordpress.org/browser/single-sign... WEB
https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L69
plugins.trac.wordpress.org/browser/single-sign... WEB
https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L96
plugins.trac.wordpress.org/changeset WEB
https://plugins.trac.wordpress.org/changeset?reponame=&old=3624827%40single-sign-on-for-tng&new=3624827%40single-sign-on-for-tng
www.wordfence.com/threat-intel/vulner... WEB
https://www.wordfence.com/threat-intel/vulnerabilities/id/1d8d393e-764c-491d-8afb-7d4f8d0c387a?source=cve

Frequently Asked Questions

What is CVE-2026-15964?
CVE-2026-15964 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-620: Unverified Password Change.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-15964?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-15964?
CVE-2026-15964 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-15964?
CVE-2026-15964 is classified under CWE-620: Unverified Password Change (When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication.).
How can I check Maven dependencies for CVE-2026-15964?
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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  "schema_version" : "1.4.0",
  "id" : "GHSA-75h6-5h53-j8cq",
  "modified" : "2026-08-01T09:30:24Z",
  "published" : "2026-08-01T09:30:24Z",
  "aliases" : [ "CVE-2026-15964" ],
  "details" : "The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the `ssoprocess_ajax()` function — registered on `wp_ajax_nopriv_ssoprocess_ajax` and therefore reachable without authentication — accepting an attacker-supplied `email` parameter with the `setnewpassword` operation and calling `reset_password()` on the resolved account without any ownership token, email confirmation link, or capability check. The sole guard is a call to `check_ajax_referer()`, which provides no authorization barrier because the `ssoajaxnonce` nonce is publicly broadcast on every front-end page via `wp_localize_script()` into the `SSOPWDREQUIREMENT` JavaScript object; since WordPress computes nonces for logged-out visitors against a shared anonymous session context, any unauthenticated visitor can scrape a valid nonce from the homepage and use it to authenticate the request. This makes it possible for unauthenticated attackers to change the password of any WordPress account, including administrator accounts, enabling complete site takeover.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
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    "url" : "https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L102"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L120"
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    "url" : "https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L69"
  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/1d8d393e-764c-491d-8afb-7d4f8d0c387a?source=cve"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-620" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-01T09:17:00Z"
  }
}