CVE-2026-19991: Software Security Vulnerability Vulnerability
HIGHCVE-2026-19991 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-19991 at a Glance
Security Impact
CVSS: 8.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H).
How to Fix CVE-2026-19991
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.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-19991, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. 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
References
Frequently Asked Questions
What is CVE-2026-19991?
Which Software versions are affected?
What version fixes CVE-2026-19991?
What is the CVSS score of CVE-2026-19991?
What CWE is associated with CVE-2026-19991?
How can I check Maven dependencies for CVE-2026-19991?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-mw4c-2xg7-r9h8",
"modified" : "2026-09-11T06:31:13Z",
"published" : "2026-09-11T06:31:13Z",
"aliases" : [ "CVE-2026-19991" ],
"details" : "The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account 'file' form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal '../'. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded '..<uploads-baseurl>' tokens to collapse into '../../' traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site's server (including wp-config.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-19991"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2076"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2420"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2432"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-validation.php#L194"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/helpers/misc.php#L2107"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3650759%40userswp%2Ftrunk&old=3618724%40userswp%2Ftrunk&sfp_email=&sfph_mail="
}, {
"type" : "WEB",
"url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/dfa094d3-e8db-4402-ad23-e161b1b6181e?source=cve"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-09-11T04:17:34Z"
}
}