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CVE-2025-5537: Lightbox & Modal Popup WordPress Plugin – FooBox <= 2.7.34 - Authenticated (Author+) Stored Cross-Site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-08 · updated 2026-06-17
• Weakness: CWE-79

Description

The Lightbox & Modal Popup WordPress Plugin – FooBox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via image alternative texts in all versions up to, and including, 2.7.34 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• fooplugins Foobox: before 2.7.35 — fixed in 2.7.35

How to fix

Upgrade to a fixed version: fooplugins Foobox 2.7.35. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3322273%40foobox-image-lightbox&new=3322273%40foobox-image-lightbox&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/b5fd2163-b8ef-4dd1-a12b-cd9187145134?source=cve

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