What is CVE-2011-1028?

CVE-2011-1028 is a critical-severity vulnerability in Smarty, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-11-20.

How severe is CVE-2011-1028?

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

Improper input validation in Smarty

CVE-2011-1028

The $smarty.template variable in Smarty3 allows attackers to possibly execute arbitrary PHP code via the sysplugins/smarty_internal_compile_private_special_variable.php file.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-11-20 · 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: 0.016 (75.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Smarty
Smarty3 — versions 3
Debian Linux — versions 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-tracker.debian.org/tracker/CVE-2011-1028 (Third Party Advisory)
access.redhat.com/security/cve/cve-2011-1028 (Broken Link)
seclists.org/oss-sec/2011/q1/313 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2011-1028?: CVE-2011-1028 is a critical-severity vulnerability in Smarty, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-11-20.
How severe is CVE-2011-1028?: Critical severity. CVSS v3 base score is 9.8 out of 10.