CVE-2026-121763 Details
Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPMU DEV Hummingbird hummingbird-performance allows Stored XSS.This issue affects Hummingbird: from n/a through 3.21.2.
A stored cross-site scripting vulnerability has been identified in the WPMU DEV Hummingbird plugin, specifically in versions through 3.21.2. This issue allows attackers to inject malicious scripts that are executed when users visit the affected page.
Users are advised to update the Hummingbird plugin to version 4.0.0 or later. For those unable to update manually, assistance can be sought from their hosting provider or web developer.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 9, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| WPMU DEV Hummingbird | <= 3.21.2 (semver) |
CPE
Remediation
| |
Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 9, 2026 | New CVE Received | [email protected] |
Volerion