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CVE-2025-13861: HTML Forms – Simple WordPress Forms Plugin <= 1.6.0 - Unauthenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-17 · updated 2026-06-17
• Weakness: CWE-79

Description

The HTML Forms – Simple WordPress Forms Plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.0 due to insufficient sanitization of fabricated file upload field metadata before displaying it in the WordPress admin dashboard. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute whenever an administrator accesses the form submissions page.

Affected products

• linksoftware HTML Forms – Simple WordPress Forms Plugin: through 1.6.0

References

• https://plugins.trac.wordpress.org/browser/html-forms/trunk/src/functions.php#L321
• https://plugins.trac.wordpress.org/browser/html-forms/trunk/src/functions.php#L357
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3419926%40html-forms%2Ftrunk&old=3407043%40html-forms%2Ftrunk&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/52e2f1b9-d240-4813-9124-51bd6b047553?source=cve

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