Concrete5 5.7.3.1 - Multiple XSS

Overview #

Multiple Cross-site Scripting (XSS) vulnerabilities exist in Concrete5 CMS version 5.7.3.1. These vulnerabilities allow remote attackers to inject arbitrary web script or HTML.

Vulnerability Details #

Affected Versions: 5.7.3.1 and earlier

Root Cause: Insufficient input validation and output encoding on multiple parameters allows XSS attacks.

Exploitation Requirements #

• No authentication required for some vectors
• Victim must visit crafted URLs or pages

Impact #

Remote attackers can exploit these vulnerabilities to:

• Steal admin session cookies
• Perform actions on behalf of users
• Compromise the CMS installation

Proof of Concept #

Details available upon request.

Solution #

Upgrade to a patched version of Concrete5 that includes proper input sanitization and output encoding.

References #

• CVE-2015-2250

Timeline #

• 2015-01-01 — Discovered

Credits: Omar Kurt