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CVE-2026-103999— Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated Stored Cross-Site Scripting via File Upload

Quick assessment

Affected
themefic Ultra Addons for Contact Form 7
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的"Contact Form 7 的 Ultra Addons"插件在所有 3.5.54 及以下版本中，由于输入过滤和输出转义不足，存在通过文件上传导致的存储型跨站脚本（Stored XSS）漏洞。该漏洞允许未认证的攻击者在页面上注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。攻击者可通过上传文本类型文件（如 .txt、.csv、.vtt、.srt、.asc）来绕过扩展名黑名单防护机制，因为这些文件的内容以 HTML 有效载荷（例如 ）开头，而插件的检查逻辑仅将此类文件归类为

CVSS 7.2 · High EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
themefic Ultra Addons for Contact Form 7 ≤ 3.5.54 affected
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I. Basic Information for CVE-2026-103999

Vulnerability Information
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Vulnerability Title
Ultra Addons for Contact Form 7 <= 3.5.54 - Unauthenticated Stored Cross-Site Scripting via File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
themefic Ultra Addons for Contact Form 7 0 ~ 3.5.54 -

II. Public POCs for CVE-2026-103999

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III. Intelligence Information for CVE-2026-103999

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Patches & Fixes for CVE-2026-103999 (1)

Vendor Advisories for CVE-2026-103999 (1)

Other References for CVE-2026-103999 (1)

Same Patch Batch · themefic · 2026-10-16 · 3 CVEs total

CVE-2026-103480 6.4 MEDIUM Tourfic <= 3.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'type' Sho
CVE-2026-97470 6.4 MEDIUM Tourfic <= 3.0.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Comment Con

IV. Related Vulnerabilities

Same product: Ultra Addons for Contact Form 7
Same vendor: themefic
Same weakness: CWE-79

V. Comments for CVE-2026-103999

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