CVE-2026-109400: Software Security Vulnerability Vulnerability
HIGHCVE-2026-109400 is a HIGH (CVSS 7.5) security vulnerability vulnerability (CWE-269: Improper Privilege Management) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-109400 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-109400
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-2026-109400, 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-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an 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-2026-109400?
Which Software versions are affected?
What version fixes CVE-2026-109400?
What is the CVSS score of CVE-2026-109400?
What CWE is associated with CVE-2026-109400?
How can I check Maven dependencies for CVE-2026-109400?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-frvw-wvjh-gg5q",
"modified" : "2026-10-16T06:30:26Z",
"published" : "2026-10-16T06:30:26Z",
"aliases" : [ "CVE-2026-109400" ],
"details" : "The InstaWP Connect – 1-click WP Staging & Migration plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 0.1.4.1 This is due to the plugin registering its admin page via `add_management_page()` using a role name returned by `InstaWP_Setting::get_allowed_role()` as the required capability — which WordPress resolves as a real capability match for any user holding that role — combined with `generate_section_field()` rendering the master API key from the `instawp_api_options` option directly as the `value` attribute of a plain-text HTML input with no additional `manage_options` or equivalent capability check. This makes it possible for authenticated attackers with Subscriber-level access and above to read the plaintext master API key, use its SHA-256-derived secret as a bearer token accepted by the plugin's REST API `validate_api_request()`, and call `POST /wp-json/instawp-connect/v2/auto-login` to mint a 30-second single-use login URL that sets an administrator authentication cookie — fully escalating their privileges. Exploitation requires the site to be actively connected to InstaWP and an administrator to have added the attacker's role to the plugin's Sync Tab Access list (`instawp_sync_tab_roles`); notably, the settings tab suppression logic only hides the tab when `administrator` is absent from the list entirely, meaning a mixed configuration retaining administrator alongside a lower role still serves the full settings page — including the API key — to the lower-privileged user.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-109400"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/admin/class-instawp-admin.php#L153"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/includes/apis/class-instawp-rest-api.php#L663"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/includes/class-instawp-hooks.php#L194"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/includes/class-instawp-setting.php#L186"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/includes/class-instawp-setting.php#L91"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/instawp-connect/tags/0.1.4.1/includes/functions.php#L1041"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/changeset/3743786/instawp-connect/trunk/includes/class-instawp-setting.php"
}, {
"type" : "WEB",
"url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/925b009e-3aeb-496d-8218-6ea5dc9d9989?source=cve"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-269" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-10-16T05:17:29Z"
}
}