CVE-2026-103999highCWE-79

CVE-2026-103999: high-severity vulnerability in themefic Ultra Addons for Contact Form 7

Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated Stored Cross-Site Scripting via File Upload

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.2epss 0.3%
The Ultra Addons for Contact Form 7 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via File Upload in all versions up to, and including, 3.5.54 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. The extension blocklist gatekeeper is bypassed by uploading text-type files (.txt, .csv, .vtt, .srt, .asc) whose contents begin with an HTML payload such as '<BODY onload=…>', as the check classifies these files as text/plain without inspecting their byte content.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products
themefic · Ultra Addons for Contact Form 7
Related CVEs — themefic Ultra Addons for Contact Form 7

In the same product, most dangerous first.

CVE-2026-82901CRITICALUltra Addons for Contact Form 7 <= 3.5.50 - Unauthenticated Arbitrary File Upload via Signature Form FieldEPSS 4.3%CVE-2025-6220HIGHUltimate Addons for Contact Form 7 <= 3.5.12 - Authenticated (Administrator+) Arbitrary File Upload via 'save_options'EPSS 1.1%CVE-2026-102435CRITICALUltra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated PHP Object Injection to Arbitrary File Deletion via CF7 Form FieldEPSS 0.6%CVE-2025-14356MEDIUMUltra Addons for Contact Form 7 <= 3.5.33 - Missing Authorization to Authenticated (Subscriber+) to Generate Form Submission PDFEPSS 0.4%CVE-2025-6212HIGHUltra Addons for Contact Form 7 3.5.11 - 3.5.19 - Unauthenticated Stored Cross-Site Scripting via Database moduleEPSS 0.3%CVE-2026-12801MEDIUMUltra Addons for Contact Form 7 <= 3.5.43 - Authenticated (Contributor+) Stored Cross-Site Scripting via Slider AttributesEPSS 0.3%