Auth bypass in Ulicms
CVE-2023-53923
UliCMS 2023.1 contains a privilege escalation vulnerability that allows unauthenticated attackers to create administrative accounts through the UserController endpoint. Attackers can send a crafted POST request to /dist/admin/index.php with specific parameters to generate a new admin user with full system access.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Ulicms — versions 2023.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/51433 (Exploit, exploit)
- web.archive.org/web/20230314183734/https://en.ulicms.de/ (Product, product)
- www.vulncheck.com/advisories/ulicms-privilege-escalation-via-unauthenticated-ad… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2023-53923?
- CVE-2023-53923 is a critical-severity vulnerability in Ulicms, classified under Missing Authorization. CVSS score: 9.8/10. Published 2025-12-17.
- How severe is CVE-2023-53923?
- Critical severity. CVSS v3 base score is 9.8 out of 10.