# CVE-2026-76800: DeDeCMS unrestricted file upload in media dialog

Source: https://junglewise.ai/threats/cve-2026-76800-dedecms-unrestricted-file-upload-in-media-dialog  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-76800 · Severity: medium · CVSS 6.3 · Published 2026-08-20

DeDeCMS is a content management system used to manage website content and media. A flaw in the media upload functionality allows attackers to upload files without proper restrictions, potentially enabling them to inject malicious content or gain unauthorized access to the system.

Technologies: [DedeCMS](https://junglewise.ai/threats/technologies/dedecms). Vendors: [DedeCMS](https://junglewise.ai/threats/vendors/dedecms).

## Quick answers

**Is CVE-2026-76800 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76800 being exploited in the wild.

**How severe is CVE-2026-76800?** Medium severity, with a CVSS score of 6.3, published 20 August 2026.

**Which products and versions are affected?** DedeCMS 3.

**Is there a fix for CVE-2026-76800?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-76800 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-76800?** Check whether you run DedeCMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An unrestricted file upload vulnerability exists in DeDeCMS 3 within the /include/dialog/select_media_post.php file. The vulnerability is triggered by manipulation of the uploadfile parameter, which fails to enforce adequate validation on uploaded files. The attack is remotely exploitable and does not require authentication. An attacker can leverage this to upload arbitrary files to the server, which may lead to remote code execution, malware injection, or other forms of system compromise.

## Affected products

- DeDeCMS DeDeCMS 3

## Timeline

- 2026-08-20: disclosed

## References

- [https://uvxbywu62qm.feishu.cn/wiki/TKqDwJGYaiBVXpk3EtFcdjRDnsg?from=from_copylink](https://uvxbywu62qm.feishu.cn/wiki/TKqDwJGYaiBVXpk3EtFcdjRDnsg?from=from_copylink)
- [https://vuldb.com/cve/CVE-2026-76800](https://vuldb.com/cve/CVE-2026-76800)

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