What’s Vulnerable › Vulnerabilities
CVE-2026-77115: Brave Popup Builder < 0.8.6 - Unauthenticated Reflected XSS via UTM Parameters
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-23 · updated 2026-10-12
- Weakness: CWE-79
Description
Brave Popup Builder (brave-popup-builder) up to version 0.8.5 reflects UTM query parameters into popup form HTML without escaping them.
Affected products
- Brave: before 0.8.6 — fixed in 0.8.6
How to fix
Upgrade to a fixed version: Brave 0.8.6. Check the vendor advisory for mitigations.
References
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