CVE-2026-81571 PUBLISHED

Brave Popup Builder < 0.8.8 - Unauthenticated Arbitrary Shortcode Execution via UTM Parameter

Assigner: WPScan
Reserved: 27.08.2026 Published: 02.09.2026 Updated: 02.09.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 4.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Unknown
Product	Brave
Versions	Default: unaffected affected from 0 to 0.8.8 (excl.)

Credits

Erwan LR (WPScan) finder
WPScan coordinator

References

https://wpscan.com/vulnerability/049d0bfc-962b-4f5b-a089-c45f4ad981e3/

Problem Types

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE