CVE-2026-83526: Software Security Vulnerability Vulnerability
HIGHCVE-2026-83526 is a HIGH (CVSS 8.8) security vulnerability vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product allows the upload or transfer of dangerous file types that are automatically processed within its environment.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-83526 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-2026-83526
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-2026-83526, 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. 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-2026-83526?
Which Software versions are affected?
What version fixes CVE-2026-83526?
What is the CVSS score of CVE-2026-83526?
What CWE is associated with CVE-2026-83526?
How can I check Maven dependencies for CVE-2026-83526?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-p776-3xx4-5fcg",
"modified" : "2026-10-10T06:30:59Z",
"published" : "2026-10-10T06:30:59Z",
"aliases" : [ "CVE-2026-83526" ],
"details" : "The FV Player 8 plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 8.1.7 via the check_mimetype function. This is due to insufficient file type validation in check_mimetype(), which writes attacker-supplied remote file content to the public uploads directory before any MIME or extension check, combined with a missing capability check on new player creation. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. This requires successfully exploiting a race condition.",
"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-2026-83526"
}, {
"type" : "WEB",
"url" : "https://github.com/foliovision/fv-wordpress-flowplayer/releases/tag/8.1.8"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/editor.php#L36"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/controller/frontend.php#L1211"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L105"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L148"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/checker.php#L181"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db-video.php#L855"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1102"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L1173"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/fv-player/trunk/models/db.php#L46"
}, {
"type" : "WEB",
"url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/5c75cb7b-1ebe-411c-8664-848d741e40d4?source=cve"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-434" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-10-10T06:16:43Z"
}
}