What is CVE-2026-77115?

CVE-2026-77115 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-23.

How severe is CVE-2026-77115?

High severity. CVSS v3 base score is 7.1 out of 10.

CVE-2026-77115

CVE-2026-77115

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-08-23 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (15.2th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.003 · change: +0.001

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/d4a760c0-8e71-4261-a08b-9b6a296c631a/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-77115?: CVE-2026-77115 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-08-23.
How severe is CVE-2026-77115?: High severity. CVSS v3 base score is 7.1 out of 10.