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CVE-2026-81571— Brave Popup Builder < 0.8.8 - Unauthenticated Arbitrary Shortcode Execution via UTM Parameter

Quick assessment

Affected
Unknown Brave
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.

Brave WordPress 插件在 0.8.8 版本之前，未防止用于预填表单字段的 URL 参数被传递给 WordPress 的 shortcode 引擎，从而允许未认证的攻击者在服务器端执行网站上已注册任意 shortcode。

CVSS 4.8 · Medium
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I. Basic Information for CVE-2026-81571

Vulnerability Information
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Vulnerability Title
Brave Popup Builder < 0.8.8 - Unauthenticated Arbitrary Shortcode Execution via UTM Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Brave WordPress plugin before 0.8.8 does not prevent a URL parameter used to pre-fill a form field from being passed to WordPress's shortcode engine, allowing unauthenticated attackers to have arbitrary shortcodes registered on the site executed server-side.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Brave 0 ~ 0.8.8 -

II. Public POCs for CVE-2026-81571

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III. Intelligence Information for CVE-2026-81571

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Other References for CVE-2026-81571 (1)

Same Patch Batch · Unknown · 2026-09-02 · 66 CVEs total

CVE-2026-4357 10.0 CRITICAL Embed HTML5 Game <= 1.3 - Unauthenticated Arbitrary File Upload
CVE-2026-77009 9.9 CRITICAL WatchMan-Site7 3.1.1 - 4.2.0 - Subscriber+ RCE via Debug Console
CVE-2025-9314 9.8 CRITICAL Developer Tools <= 1.1.3 – Unauthenticated Arbitrary File Upload
CVE-2025-15485 8.2 HIGH Auto x LINE <= 1.0.0 – Unauthenticated REST API Endpoints Call
CVE-2026-82884 6.8 MEDIUM All in One SEO < 5.0.0.1 - Contributor+ Stored XSS via ai-assistant Block
CVE-2026-83547 6.8 MEDIUM Xpro Elementor Addons 1.6.0 - 1.7.3 - Contributor+ Stored XSS via Multiple Widgets
CVE-2026-10821 6.6 MEDIUM Yoast SEO Premium < 27.6.1 - Author+ Arbitrary .htaccess Directive Injection to RCE
CVE-2026-2688 6.5 MEDIUM CM HIPAA Forms < 3.2.0 - Unauthenticated Authorization Bypass
CVE-2024-3773 5.9 MEDIUM LiveJournal Shortcode <= 1.1.1 - Contributor+ Stored XSS via Shortcode
CVE-2026-2811 5.4 MEDIUM Ajaxify Comments < 3.2 - Unauthenticated HTTP Header Injection
CVE-2026-8151 5.4 MEDIUM Simple Membership MailChimp Integration < 1.9.8 - API Key Update via CSRF
CVE-2025-15489 5.3 MEDIUM Passster < 4.2.24 - Password Protection Bypass
CVE-2026-78153 5.3 MEDIUM Restrict User Access 2.6 - 2.8 - Unauthenticated Content Protection Bypass via REST API Ro
CVE-2026-83533 5.3 MEDIUM WP Express Checkout < 2.4.9 - Unauthenticated Payment Bypass via wpec_process_payment
CVE-2025-15481 5.3 MEDIUM Notification Bar for WordPress <= 1.1.8 – Unauthenticated Subscriber Data Disclosure
CVE-2026-77794 5.3 MEDIUM RegistrationMagic 6.0.0.0 - 6.0.9.8 - Unauthenticated Payment Bypass via Zero Quantity
CVE-2026-77793 5.3 MEDIUM RegistrationMagic < 6.0.9.9 - Unauthenticated Payment Bypass via Omitted Price Field
CVE-2025-15490 5.3 MEDIUM Passster < 4.2.26 - Global Protection Bypass
CVE-2025-8945 5.3 MEDIUM Wp Edit Password Protected < 1.3.5 - Protection Bypass via REST API
CVE-2026-17563 5.3 MEDIUM WP User Frontend < 4.3.11 - Unauthenticated Post Creation via Subscription-Gated Form

Showing top 20 of 66 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Brave
Same vendor: Unknown

V. Comments for CVE-2026-81571

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