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The vulnerability CVE-2025-8897 is a Reflected Cross-Site Scripting (XSS) flaw in the Beaver Builder WordPress page builder plugin. It exists in all plugin versions up to and including 2.9.2.1. The core issue is insufficient input sanitization and output escaping of the ‘fl_builder‘ parameter. When this parameter is included in a URL, its value is not properly neutralized before being reflected in the server’s HTTP response. An unauthenticated attacker can craft a malicious link containing a script payload within this parameter. If a user is tricked into clicking the link, the embedded JavaScript executes immediately in their browser within the context of the vulnerable WordPress site. This allows the attacker to perform actions such as stealing the victim’s session cookies or redirecting them to a malicious site.
dailycve form:
Platform: WordPress
Version: ≤ 2.9.2.1
Vulnerability: Reflected XSS
Severity: Medium
date: 2025-08-27
Prediction: 2025-08-26
What Undercode Say:
Analytics
Command to list installed Beaver Builder version:
`wp plugin list –format=csv | grep -i beaver`
Command to search for potential exploit attempts in web server logs:
`zgrep -i “fl_builder\|
Command to find recently modified files in web root:
`find /var/www/html -type f -mtime -7 -print`
How Exploit:
1. Attacker crafts a URL with a malicious script in the `fl_builder` parameter.
2. Attacker lures a victim to click the link via phishing or social engineering.
3. The vulnerable site reflects the unsanitized script in its response.
4. The victim’s browser executes the script, compromising their session.
Protection from this CVE
Update the Beaver Builder plugin to version 2.9.3.1 or later.
Implement a Web Application Firewall (WAF) rule to block requests containing obvious XSS patterns like `Impact
Command to find recently modified files in web root:
`find /var/www/html -type f -mtime -7 -print`
How Exploit:
1. Attacker crafts a URL with a malicious script in the `fl_builder` parameter.
2. Attacker lures a victim to click the link via phishing or social engineering.
3. The vulnerable site reflects the unsanitized script in its response.
4. The victim’s browser executes the script, compromising their session.
Protection from this CVE
Update the Beaver Builder plugin to version 2.9.3.1 or later.
Implement a Web Application Firewall (WAF) rule to block requests containing obvious XSS patterns like `
Theft of user session cookies and authentication tokens.
Client-side browser hijacking and redirects to malicious sites.
Potential for attackers to perform actions on behalf of the victim user.
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Sources:
Reported By: [nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2025-8897)
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