CVE-2026-77115

Brave Popup Builder < 0.8.6 - Unauthenticated Reflected XSS via UTM Parameters

Brave Popup Builder (brave-popup-builder) up to version 0.8.5 reflects UTM query parameters into popup form HTML without escaping them.

Affected

Brave

CVSS v3.1 CNA

7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS

0.25% chance of exploitation in the next 30 days, 16th percentile

Published

2026-08-23

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/d4a760c0-8e71-4261-a08b-9b6a296c631a/

References

• CVE Record
• NVD entry