CVE-2026-82531

Smarty before 3.1.21 allows remote attackers to bypass the secure mode restrictions and execute arbitrary PHP code, as demonstrated by "{literal}<{/literal}script language=php>" in a template.

Smarty is a template engine for PHP. Prior to 4.5.7 and 5.8.2, the {fetch} handling used Security::isTrustedUri() to validate only the initial remote URL, and PHP followed HTTP redirects by default. An attacker with an open redirect on a trusted host could redirect the request to an internal endpoint, bypassing the trusted_uri allowlist and performing SSRF.

Smarty is a template engine for PHP. From 5.0.0 until 5.8.4, Smarty's stream: resource-name handling does not adequately restrict which PHP stream wrappers and filter chains can be referenced from a template, allowing a php://filter-wrapped resource name to read arbitrary local files accessible to the PHP process. An attacker able to author or influence a template's resource reference could exploit this to disclose sensitive file contents. Fixed in version 5.8.4.

Smarty is a template engine for PHP. Prior to 5.8.2 (and 4.5.7 on the 4.x line), Security::_checkDir() does not fully resolve symbolic links before validating that a requested path lies within a configured secure directory. An attacker able to place or reference a symlink within a trusted directory could point outside the intended secure directory, bypassing the containment check and reading arbitrary files accessible to the PHP process. Fixed in versions 5.8.2 and 4.5.7.

A missing sanitisation vulnerability exists with user input in the stats-video.php script. The way URLs to this script were constructed did not follow best practices, and the output of the Smarty custom helper function url was neither properly encoded nor sanitised, allowing user‑supplied input to be reflected without escaping.