CVE-2026-104764: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-g9fm-v4gr-h48h
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CVSS 7.2
CWE-502
Published
Advisory Summary

CVE-2026-104764 is a HIGH (CVSS 7.2) security vulnerability vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-104764 at a Glance

CVE Identifier CVE-2026-104764
GHSA Identifier GHSA-g9fm-v4gr-h48h
Severity HIGH
CVSS v3.1 Base Score 7.2
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.2

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
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-2026-104764

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-2026-104764, 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. 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 Post Export Import with Media plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.17.1 via deserialization of untrusted input . This makes it possible for authenticated attackers, with administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

References

NVD — CVE-2026-104764 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104764
plugins.svn.wordpress.org/post-export-import-... WEB
https://plugins.svn.wordpress.org/post-export-import-with-media/trunk
plugins.trac.wordpress.org/browser/post-export... WEB
https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L230
plugins.trac.wordpress.org/browser/post-export... WEB
https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L370
plugins.trac.wordpress.org/browser/post-export... WEB
https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L646
plugins.trac.wordpress.org/browser/post-export... WEB
https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L877
plugins.trac.wordpress.org/changeset/3726397/p... WEB
https://plugins.trac.wordpress.org/changeset/3726397/post-export-import-with-media/trunk/includes/class-page-handler.php
www.wordfence.com/threat-intel/vulner... WEB
https://www.wordfence.com/threat-intel/vulnerabilities/id/bf16e980-7cee-4f62-8a2d-0cf73fc2ca26?source=cve

Frequently Asked Questions

What is CVE-2026-104764?
CVE-2026-104764 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-502: Deserialization of Untrusted Data.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-104764?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-104764?
CVE-2026-104764 has a CVSS v3.1 base score of 7.2 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-104764?
CVE-2026-104764 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2026-104764?
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 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g9fm-v4gr-h48h",
  "modified" : "2026-10-14T09:31:34Z",
  "published" : "2026-10-14T09:31:34Z",
  "aliases" : [ "CVE-2026-104764" ],
  "details" : "The Post Export Import with Media plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.17.1 via deserialization of untrusted input . This makes it possible for authenticated attackers, with administrator-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-104764"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.svn.wordpress.org/post-export-import-with-media/trunk"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L230"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L370"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L646"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/browser/post-export-import-with-media/tags/1.17.1/includes/class-page-handler.php#L877"
  }, {
    "type" : "WEB",
    "url" : "https://plugins.trac.wordpress.org/changeset/3726397/post-export-import-with-media/trunk/includes/class-page-handler.php"
  }, {
    "type" : "WEB",
    "url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/bf16e980-7cee-4f62-8a2d-0cf73fc2ca26?source=cve"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-14T08:17:03Z"
  }
}