Is CVE-2011-4561 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-4561, but active exploitation has not been confirmed.

Can CVE-2011-4561 be exploited remotely?

Yes. CVE-2011-4561 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-4561?

CVE-2011-4561 has a CVSS score of 4.3 (MEDIUM).

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MEDIUMPOC

CVE-2011-4561

CWE-79Published: November 28, 2011· Updated: Jun 16, 2026

4.3

CVSS v3.1

Official Description

Cross-site scripting (XSS) vulnerability in admin.php in Phorum 5.2.18 allows remote attackers to inject arbitrary web script or HTML via the PATH_INFO to admin/index.php. NOTE: some of these details are obtained from third party information.

NVD Source

Technical Analysis

CVE-2011-4561 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-2011-4561. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.