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Technology
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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| smarty/smarty | composer | < 3.1.47 | 3.1.47 |
| smarty/smarty | composer | >= 4.0.0, < 4.2.1 | 4.2.1 |
The commit diff shows the vulnerable function added htmlspecialchars() escaping to the address/text parameters in the mailto link generation. Prior to this fix, parameters were directly interpolated into HTML/JS contexts without proper encoding. The CVE description explicitly states the mailto plugin's handling of user parameters was the attack vector, and the GitHub issue #454 demonstrates a working XSS payload exploiting this lack of escaping.
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