CVE-2026-86583: Software Security Vulnerability Vulnerability
HIGHCVE-2026-86583 is a HIGH (CVSS 8.8) security vulnerability vulnerability (CWE-266: Incorrect Privilege Assignment) affecting Software libraries in the Maven ecosystem. The weakness occurs when a product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-86583 at a Glance
Security Impact
CVSS: 8.8
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:H/I:H/A:H).
How to Fix CVE-2026-86583
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-2026-86583, 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-266: Incorrect Privilege Assignment, where a product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor. 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-2026-86583?
Which Software versions are affected?
What version fixes CVE-2026-86583?
What is the CVSS score of CVE-2026-86583?
What CWE is associated with CVE-2026-86583?
How can I check Maven dependencies for CVE-2026-86583?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-42cf-ph32-46f5",
"modified" : "2026-09-24T00:30:25Z",
"published" : "2026-09-24T00:30:25Z",
"aliases" : [ "CVE-2026-86583" ],
"details" : "The Import and export users and customers plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.4.17 via the plugin's own export and re-import workflow. The vulnerability exists because the exporter writes CSV cells using fputcsv() with a NUL byte (\\0) as the escape character, while the importer parses the same file using SplFileObject::fgetcsv() with only a single delimiter argument, causing PHP's default backslash escape character to be applied instead; because the export column layout places display_name immediately before the role column and nickname immediately after, an attacker can store crafted values in those two profile fields — saved by WordPress core via the standard profile page — such that the escape mismatch causes the parser to merge the display_name cell into the role field and rebalance the column count via nickname, yielding administrator as the parsed role for their own row when it reaches the import_user function's add_role function. This makes it possible for authenticated attackers with Subscriber-level access or above to escalate their privileges to Administrator. Exploitation requires a site administrator to trigger the plugin's documented export re-import migration with both \"Update existing users\" and \"Update roles for existing users\" set to \"yes\".",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86583"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/batch_exporter.php#L459"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/helper.php#L78"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L1356"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L872"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/import-users-from-csv-with-meta/tags/2.4.17/classes/import.php#L888"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/changeset/3687349/import-users-from-csv-with-meta"
}, {
"type" : "WEB",
"url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/5b0f3444-4c10-45ce-a00b-4ed6038b8846?source=cve"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-266" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-09-23T22:16:59Z"
}
}