CVE-2026-103999 Ultra Addons for Contact Form 7 - Stored XSS

Ultra Addons for Contact Form 7 WordPress plugin <= 3.5.54 contains a stored cross-site scripting caused by insufficient input sanitization and output escaping in file upload, letting unauthenticated attackers inject and execute arbitrary scripts, exploit requires uploading crafted text files bypassing extension blocklist.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
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