| Title | https://www.dedecms.com/ DeDeCMS v3 Unrestricted Upload |
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| Description | DedeCMS (Dede Content Management System) is one of the most renowned open-source PHP website management systems in China, well-known for its simplicity, practicality and open-source features. DedeCMS is mainly developed for individual webmasters and small-to-medium web portals, and it is also widely adopted by enterprises and educational institutions.
Official Website: https://www.dedecms.com/ Download Link: https://zdown.chinaz.com/%E5%85%B6%E5%AE%83%E7%B1%BB%E5%88%AB/dede3.rar
Involved version: V3
The cause of this file upload vulnerability: it relies only on client-controllable Content-Type to check the file type, doesn't block PHP and other script extensions, and the external parameter activepath isn't filtered, leading to directory traversal. It directly concatenates user-controlled filenames into the target path, allowing the upload and execution of a webshell.
https://uvxbywu62qm.feishu.cn/wiki/TKqDwJGYaiBVXpk3EtFcdjRDnsg?from=from_copylink |
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| Source | ⚠️ https://uvxbywu62qm.feishu.cn/wiki/TKqDwJGYaiBVXpk3EtFcdjRDnsg?from=from_copylink |
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| User | huliangjia (UID 99519) |
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| Submission | 07/04/2026 13:44 (2 months ago) |
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| Moderation | 08/19/2026 21:29 (2 months later) |
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| Status | Accepted |
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| VulDB entry | 393317 [DeDeCMS 3 select_media_post.php uploadfile unrestricted upload] |
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| Points | 20 |
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