Arbitrary file upload in Wuzhicms
CVE-2026-91849
A security flaw has been discovered in WuzhiCMS up to 4.1.0. This affects the function member::setAvatar of the file /index.php?m=member&f=user&v=setAvatar of the component Avatar Upload. The manipulation of the argument File results in unrestricted upload. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
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: 0.004 (30.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Wuzhicms — versions 4.0, 4.1.0
Weakness classification (CWE)
References
- vuldb.com/vuln/404077 (technical-description, vdb-entry)
- vuldb.com/vuln/404077/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-91849 (third-party-advisory)
- vuldb.com/submit/933702 (third-party-advisory)
- github.com/wuzhicms/wuzhicms/issues/219 (issue-tracking, exploit)
- github.com/wuzhicms/wuzhicms/ (product)
Frequently asked questions
- What is CVE-2026-91849?
- CVE-2026-91849 is a medium-severity vulnerability in Wuzhicms, classified under Improper Access Control. CVSS score: 6.3/10. Published 2026-09-15.
- How severe is CVE-2026-91849?
- Medium severity. CVSS v3 base score is 6.3 out of 10.