Is CVE-2007-3963 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2007-3963, but active exploitation has not been confirmed.

Can CVE-2007-3963 be exploited remotely?

Yes. CVE-2007-3963 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2007-3963?

CVE-2007-3963 has a CVSS score of 9.3 (CRITICAL).

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CRITICALPOC

CVE-2007-3963

NVD-CWE-OtherPublished: July 25, 2007· Updated: Jun 16, 2026

9.3

CVSS v3.1

Official Description

Multiple cross-site scripting (XSS) vulnerabilities in UseBB 1.0.7, and possibly other 1.0.x versions, allow remote attackers to inject arbitrary web script or HTML via the PATH_INFO (PHP_SELF) to (1) upgrade-0-2-3.php, (2) upgrade-0-3.php, or (3) upgrade-0-4.php in install/, a different vulnerability than CVE-2005-4193.

NVD Source

Technical Analysis

CVE-2007-3963 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2007-3963. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.