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CVE-2026-77115— Brave Popup Builder < 0.8.6 - Unauthenticated Reflected XSS via UTM Parameters

Quick assessment

Affected
Unknown Brave
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Brave Popup Builder (brave-popup-builder) 版本在 0.8.5 及以下的版本中，会将 UTM 查询参数直接反射到弹出窗口表单的 HTML 中，而未对这些参数进行转义处理。

AI Predicted 5.4 Difficulty: Easy EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Brave < 0.8.6 affected
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I. Basic Information for CVE-2026-77115

Vulnerability Information
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Vulnerability Title
Brave Popup Builder < 0.8.6 - Unauthenticated Reflected XSS via UTM Parameters
Source: CVE Program / CVE List V5
Vulnerability Description
Brave Popup Builder (brave-popup-builder) up to version 0.8.5 reflects UTM query parameters into popup form HTML without escaping them.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 ~ 0.8.6 -

II. Public POCs for CVE-2026-77115

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 8743 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-77115

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Vendor Advisories for CVE-2026-77115 (1)

Same Patch Batch · Unknown · 2026-08-23 · 5 CVEs total

CVE-2026-77116 Brave Popup Builder < 0.8.6 - Subscriber+ Unpublished Popup Disclosure via Preview
CVE-2026-77003 Content Mask 1.8.0 - 1.8.5.4 - Contributor Publish Capability Bypass via create_new_conten
CVE-2026-14853 WooCommerce Bookings < 3.9.0 - Subscriber+ Draft Bookable Product Creation via Missing Aut
CVE-2026-13598 RestrictMate < 1.3.0 - Unauthenticated Privilege Escalation to Administrator

IV. Related Vulnerabilities

Same product: Brave
Same vendor: Unknown

V. Comments for CVE-2026-77115

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