Brave Popup Builder <= 0.8.7 — Unauthenticated Arbitrary Shortcode Execution
CVE-2026-81571Published · Updated Action summary
Affected: ≤0.8.7Update to 0.8.8 or newer
All remediation steps- Severity
- Medium6.5
- CVSS
- 6.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content brave-popup-builder
- Affected≤ 0.8.7
- Patched in0.8.8
Update to 0.8.8 or newer.
You are affected if you run ≤ 0.8.7. Version 0.8.8 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 0.8.8, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Erwan LR.
The Brave Popup Builder plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 0.8.7. This is due to passing a user-controlled URL parameter through do_shortcode() before output in a hidden form field without authentication. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes registered on the site by supplying a crafted UTM parameter that pre-fills a hidden form field.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Brave – Create Popup, Optins, Lead Generation, Survey, Sticky Elements & Interactive Content
All 9| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Arbitrary Content Injection ≤0.8.8Update to 0.8.9 | CVE-2026-48202 | |
| Medium6.1 | Reflected Cross-Site Scripting <0.8.6Update to 0.8.6 | CVE-2026-77115 | |
| Medium4.3 | Authenticated (Subscriber+) Insecure Direct Object Reference ≤0.8.5Update to 0.8.6 | CVE-2026-77116 | |
| Medium5.3 | Missing Authorization ≤0.8.3Update to 0.8.4 | CVE-2025-68508 | |
| Medium4.3 | Cross-Site Request Forgery ≤0.7.0Update to 0.7.1 | CVE-2024-43337 |
- Medium5.3Unauthenticated Arbitrary Content Injection
≤0.8.8Update to 0.8.9
- Medium6.1Reflected Cross-Site Scripting
<0.8.6Update to 0.8.6
- Medium4.3Authenticated (Subscriber+) Insecure Direct Object Reference
≤0.8.5Update to 0.8.6
- Medium5.3Missing Authorization
≤0.8.3Update to 0.8.4
- Medium4.3Cross-Site Request Forgery
≤0.7.0Update to 0.7.1
Timeline
CVE published
Severity medium, CVSS 6.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.