Auth bypass in Thecosy Icecms
CVE-2026-111673
IceCMS through 4.1.5 contains a missing authentication vulnerability that allows unauthenticated attackers to modify, delete, or disable any account because /User/** is excluded from the Shiro jwt filter. Attackers can send PUT requests to /User/updateUser to set a new password and role on any userId, including administrators, enabling full account takeover.
Vulnerability class: Broken Authentication
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
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/icecms-backend-user-admin-unauth-account-takeover (third-party-advisory)
- github.com/Thecosy/IceCMS/blob/afd7a9f0d04a714e7c7e735e566c27f54b5d5201/IceCMS-… (technical-description)
- github.com/Thecosy/IceCMS/blob/afd7a9f0d04a714e7c7e735e566c27f54b5d5201/IceCMS-… (technical-description)
- github.com/Thecosy/IceCMS (product)
- www.vulncheck.com/advisories/icecms-through-4.1.5-missing-authentication-via-us… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111673?
- CVE-2026-111673 is a critical-severity vulnerability in Thecosy Icecms, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-16.
- How severe is CVE-2026-111673?
- Critical severity. CVSS v3 base score is 9.8 out of 10.