CVE-2023-28447: Cross site scripting vulnerability in Javascript escaping in smarty/smarty

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-28 · updated 2026-06-17
Weakness: CWE-79

Description

Smarty is a template engine for PHP. In affected versions smarty did not properly escape javascript code. An attacker could exploit this vulnerability to execute arbitrary JavaScript code in the context of the user's browser session. This may lead to unauthorized access to sensitive user data, manipulation of the web application's behavior, or unauthorized actions performed on behalf of the user. Users are advised to upgrade to either version 3.1.48 or to 4.3.1 to resolve this issue. There are no known workarounds for this vulnerability.

Affected products

Fedoraproject Fedora: 36, 37, 38
Smarty: before 3.1.48; from 4.0.0 before 4.3.1 — fixed in 3.1.48, 4.3.1

How to fix

Upgrade to a fixed version: Smarty 3.1.48, 4.3.1. Check the vendor advisory for mitigations.

References

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