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CVE-2026-121763— WordPress Hummingbird plugin <= 3.21.2 - Cross Site Scripting (XSS) vulnerability

Quick assessment

Affected
WPMU DEV Hummingbird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WPMU DEV Hummingbird（hummingbird-performance）组件中存在“网页生成过程中输入未正确中和（跨站脚本，XSS）”漏洞，可导致存储型 XSS 攻击。该问题影响 Hummingbird 版本：从未知版本至 3.21.2（含）。

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-121763

Vulnerability Information
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Vulnerability Title
WordPress Hummingbird plugin <= 3.21.2 - Cross Site Scripting (XSS) vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WPMU DEV Hummingbird 0 ~ 3.21.2 -

II. Public POCs for CVE-2026-121763

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III. Intelligence Information for CVE-2026-121763

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Other References for CVE-2026-121763 (1)

IV. Related Vulnerabilities

Same product: Hummingbird
Same vendor: WPMU DEV
Same weakness: CWE-79