CVE-2026-120687— Lightbox & Modal Popup WordPress Plugin <= 2.8.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in .wp-caption Containers

Quick assessment

Affected

fooplugins Lightbox & Modal Popup WordPress Plugin – FooBox

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.

WordPress 插件 Lightbox & Modal Popup（FooBox）存在存储型 DOM 跨站脚本（Stored DOM-Based XSS）漏洞。该漏洞影响所有版本，包括且不限于 2.8.7 及更早版本，原因是输入净化不足以及输出转义不充分。具体而言，攻击者可通过容器内标签的属性参数注入任意 Web 脚本。一旦用户访问被注入的页面，这些脚本将会执行。此漏洞允许未认证的攻击者实施攻击。在已安装 bbPress 的情况下，拥有“订阅者”（Subscriber）权限的用户也可利用此漏洞。这是因

CVSS 7.2 · High EPSS 0.32% · P26 Updated Nov 15, 2026

Possible ATT&CK Techniques 2 AI

T1059.007 · JavaScript T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
fooplugins	Lightbox & Modal Popup WordPress Plugin – FooBox	`≤ 2.8.7`	affected

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Vulnerability Information

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Vulnerability Title

Lightbox & Modal Popup WordPress Plugin <= 2.8.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in .wp-caption Containers

Source: CVE Program / CVE List V5

Vulnerability Description

The Lightbox & Modal Popup WordPress Plugin – FooBox plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'img alt attribute inside .wp-caption container' parameter in all versions up to, and including, 2.8.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable by Subscriber-level users when bbPress is installed, as its bbp_filter_kses filter chain permits img and pre tags while preserving numeric character references inside attribute values, allowing encoded payloads to bypass save-time sanitization and reach the vulnerable sink fully intact. Exploitation by attackers with subscriber-level access and above requires that bbPress 2.6.20 is installed, a public forum exists, and either the first topic has already been approved or subsequent topics clear moderation. On a default installation, where that is not configured, the vulnerability requires attackers with contributor-level access and above.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
fooplugins	Lightbox & Modal Popup WordPress Plugin – FooBox	0 ~ 2.8.7	-

II. Public POCs for CVE-2026-120687

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-120687

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Vendor Advisories for CVE-2026-120687 (1)

Lightbox & Modal Popup WordPress Plugin <= 2.8.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Image Alt Attribute in .wp-caption Containers

https://www.cve.org/CVERecord?id=CVE-2026-120687

IV. Related Vulnerabilities

Same product: Lightbox & Modal Popup WordPress Plugin – FooBox

Same vendor: fooplugins

Same weakness: CWE-79