What is CVE-2011-4558?

CVE-2011-4558 is a high-severity vulnerability in Tiki, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.2/10. Published 2020-01-27.

How severe is CVE-2011-4558?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Tiki

CVE-2011-4558

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

Published 2020-01-27 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.043 (90.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000

Affected products

Tiki

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

packetstormsecurity.com/files/108111/Tiki-Wiki-CMS-Groupware-8.2-Code-Injection… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2011-4558?: CVE-2011-4558 is a high-severity vulnerability in Tiki, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.2/10. Published 2020-01-27.
How severe is CVE-2011-4558?: High severity. CVSS v3 base score is 7.2 out of 10.