Brave Popup Builder < 0.8.8 - Unauthenticated Arbitrary Shortcode Execution via UTM Parameter
Priority LOW 22CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
The Brave WordPress plugin before 0.8.8 does not prevent a URL parameter used to pre-fill a form field from being passed to WordPress's shortcode engine, allowing unauthenticated attackers to have arbitrary shortcodes registered on the site executed server-side.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00243 15th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Brave (Unknown): 0.8.8
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 0.8.8 | 0.8.8 | Patch available | CNA |
- Brave VendorUnknown Affected before 0.8.8 Fixed in 0.8.8 Patch available CNA
Remediation
- Fix · CNA Brave (Unknown) Fixed in 0.8.8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-81571
- 2026-10-03 Alias added: GHSA-mhhc-49mj-h4mm
References
Sources
- CVE-2026-81571 · CVE Program
- CVE-2026-81571 · NVD
- FIRST EPSS
- GHSA-mhhc-49mj-h4mm · 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