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The vulnerability stems from improper neutralization of browser information (CWE-74) stored in session values. The Joomla security advisory explicitly states browser information wasn't filtered during session storage. Session initialization typically handles User-Agent headers, and PHP's unserialize() operation on attacker-controlled data leads to object injection. The patched version 1.3.1 would have added filtering in this initialization path, aligning with the vulnerability pattern of unsafe session data handling.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| joomla/session | composer | < 1.3.1 | 1.3.1 |
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