Is CVE-2011-4558 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-4558, but active exploitation has not been confirmed.

Can CVE-2011-4558 be exploited remotely?

Yes. CVE-2011-4558 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-4558?

CVE-2011-4558 has a CVSS score of 7.2 (HIGH).

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HIGHPOC

CVE-2011-4558

CWE-74Published: January 27, 2020· Updated: Jun 16, 2026

7.2

CVSS v3.1

Official Description

Tiki 8.2 and earlier allows remote administrators to execute arbitrary PHP code via crafted input to the regexres and regex parameters.

NVD Source

Technical Analysis

CVE-2011-4558 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.

A proof-of-concept (PoC) exploit exists for CVE-2011-4558. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.