Brave Popup Builder < 0.8.6 - Unauthenticated Reflected XSS via UTM Parameters
Priority LOW 31CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.
Summary
Brave Popup Builder (brave-popup-builder) up to version 0.8.5 reflects UTM query parameters into popup form HTML without escaping them.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00251 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Brave (Unknown): 0.8.6
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | Brave | before 0.8.6 | 0.8.6 | Patch available | CNA |
- Brave VendorUnknown Affected before 0.8.6 Fixed in 0.8.6 Patch available CNA
Remediation
- Fix · CNA Brave (Unknown) Fixed in 0.8.6
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Brave 0.8.6
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-53860 Brave Popup Builder < 0.8.6 - Subscriber+ Unpublished Popup Disclosure via PreviewPriority LOW 20
Timeline
- 2026-10-02 Threatist record created from CVE-2026-77115
- 2026-10-03 Alias added: GHSA-x2v4-r59f-8jxr
References
Sources
- CVE-2026-77115 · CVE Program
- CVE-2026-77115 · NVD
- FIRST EPSS
- GHSA-x2v4-r59f-8jxr · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences