CVE-2026-6454— Firelight Lightbox <= 2.3.20 - Authenticated (Contributor+) Stored DOM Cross-Site Scripting via PDF beforeLoad 'href' Attribute
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| firelightwp | Firelight Lightbox | ≤ 2.3.20 | affected |
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I. Basic Information for CVE-2026-6454
Vulnerability Information
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Vulnerability Title
Firelight Lightbox <= 2.3.20 - Authenticated (Contributor+) Stored DOM Cross-Site Scripting via PDF beforeLoad 'href' Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The Firelight Lightbox plugin for WordPress is vulnerable to Stored DOM Cross-Site Scripting in versions up to and including 2.3.20. This is due to insufficient sanitization of the href attribute value within the FancyBox V2 PDF beforeLoad JavaScript callback generated in inc/fancybox-2.php, where this.href is string-concatenated directly into an HTML string without escaping, allowing a stored href containing entity-encoded double-quotes to break out of the data attribute and inject arbitrary event handlers into the DOM. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user clicks the malicious PDF link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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
Vulnerability Title
WordPress Firelight Lightbox 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
firelightwp firelight lightbox是firelightwp个人开发者开源的一款网页图片灯箱展示插件。 WordPress Firelight Lightbox 2.3.20及之前版本存在跨站脚本漏洞，该漏洞源于在inc/fancybox-2.php生成的FancyBox V2 PDF beforeLoad JavaScript回调中，对href属性值清理不足，导致存储型DOM跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| firelightwp | Firelight Lightbox | 0 ~ 2.3.20 | - |
II. Public POCs for CVE-2026-6454
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-6454 (1)
News Coverage for CVE-2026-6454 (1)
Vendor Pages for CVE-2026-6454 (1)
IV. Related Vulnerabilities
Same product: Firelight Lightbox
Same weakness: CWE-79
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LinkAce vulnerable to stored XSS via 'javascript:' URI in Bu
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