What is CVE-2011-5266?

CVE-2011-5266 is a critical-severity vulnerability in Imperva Securesphere Web Application Firewall, classified under SQL Injection. CVSS score: 9.8/10. Published 2020-01-08.

How severe is CVE-2011-5266?

Critical severity. CVSS v3 base score is 9.8 out of 10.

SQL Injection in Imperva Securesphere Web Application Firewall

CVE-2011-5266

Imperva SecureSphere Web Application Firewall (WAF) before 12-august-2010 allows SQL injection filter bypass.

Vulnerability class: SQL Injection

Published 2020-01-08 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Imperva Securesphere Web Application Firewall

Weakness classification (CWE)

CWE-89 — SQL Injection

References

seclists.org/fulldisclosure/2011/May/163 (Exploit, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2011-5266?: CVE-2011-5266 is a critical-severity vulnerability in Imperva Securesphere Web Application Firewall, classified under SQL Injection. CVSS score: 9.8/10. Published 2020-01-08.
How severe is CVE-2011-5266?: Critical severity. CVSS v3 base score is 9.8 out of 10.