CVE-2026-15421: Software Security Vulnerability Vulnerability
MODERATECVE-2026-15421 is a MODERATE (CVSS 6.4) security vulnerability vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-15421 at a Glance
Security Impact
CVSS: 6.4
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:C/C:L/I:L/A:N).
How to Fix CVE-2026-15421
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-2026-15421, 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. 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-2026-15421?
Which Software versions are affected?
What version fixes CVE-2026-15421?
What is the CVSS score of CVE-2026-15421?
What CWE is associated with CVE-2026-15421?
How can I check Maven dependencies for CVE-2026-15421?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-8r64-rxjj-mp32",
"modified" : "2026-08-19T03:31:21Z",
"published" : "2026-08-19T03:31:21Z",
"aliases" : [ "CVE-2026-15421" ],
"details" : "The Speed Optimizer – The All-In-One Performance-Boosting Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Image Tag Attributes in all versions up to, and including, 7.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the site administrator has enabled the Lazy Load Media option in the plugin settings.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15421"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.7.11/core/Lazy_Load/Abstract_Lazy_Load.php#L109"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.7.11/core/Lazy_Load/Lazy_Load.php#L39"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.7.11/core/Lazy_Load/Lazy_Load_Images.php#L31"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.8.0/core/Lazy_Load/Abstract_Lazy_Load.php#L109"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.8.0/core/Lazy_Load/Lazy_Load.php#L39"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/browser/sg-cachepress/tags/7.8.0/core/Lazy_Load/Lazy_Load_Images.php#L31"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/changeset?old_path=%2Fsg-cachepress/tags/7.8.0&new_path=%2Fsg-cachepress/tags/7.8.1"
}, {
"type" : "WEB",
"url" : "https://plugins.trac.wordpress.org/changeset?reponame=&new=3642965%40sg-cachepress%2Ftags%2F7.8.1&old=3581843%40sg-cachepress%2Ftags%2F7.8.0"
}, {
"type" : "WEB",
"url" : "https://www.wordfence.com/threat-intel/vulnerabilities/id/2626ad96-4346-4564-b6bd-0c226bd8dfd4?source=cve"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-79" ],
"severity" : "MODERATE",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-08-19T02:16:12Z"
}
}