Arbitrary file upload in Dedecms
CVE-2026-76800
A flaw has been found in DeDeCMS 3. Affected by this vulnerability is an unknown functionality of the file /include/dialog/select_media_post.php. Executing a manipulation of the argument uploadfile can lead to unrestricted upload. The attack can be executed remotely. The exploit has been published and may be used.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (26.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Dedecms — versions 3
Weakness classification (CWE)
References
- vuldb.com/vuln/393317 (technical-description, vdb-entry)
- vuldb.com/vuln/393317/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-76800 (third-party-advisory)
- vuldb.com/submit/880081 (third-party-advisory)
- uvxbywu62qm.feishu.cn/wiki/TKqDwJGYaiBVXpk3EtFcdjRDnsg (exploit)
Frequently asked questions
- What is CVE-2026-76800?
- CVE-2026-76800 is a medium-severity vulnerability in Dedecms, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-08-20.
- How severe is CVE-2026-76800?
- Medium severity. CVSS v3 base score is 6.3 out of 10.