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
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.
INFO
Published Date :
Nov. 14, 2026, 4:17 p.m.
Last Modified :
Nov. 14, 2026, 4:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the FooBox plugin to the latest version.
- Apply input sanitization and output escaping.
- Review plugin configurations for security.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-120687.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-120687 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-120687
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-120687 vulnerability anywhere in the article.