Auth bypass in Guchengwuyue Yshop-Crm
CVE-2026-109171
yshop-crm through 2.1.3 contains a missing authorization vulnerability that allows any authenticated back-office user to approve or reject contracts by calling POST /admin-api/crm/contract/check. Because CrmContractController lacks @PreAuthorize and approver checks are commented out, attackers can approve contracts to alter customer deal and purchase data or reject them to return products to stock.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
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
- github.com/AnkesKasty/cve-request-poc/blob/a7b6d1423555812d8efa26c91c5d0683164b… (exploit)
- github.com/guchengwuyue/yshop-crm/blob/a77250f7ace63d5b6b363841d9ff441e0e2a9a6b… (technical-description)
- github.com/guchengwuyue/yshop-crm/blob/a77250f7ace63d5b6b363841d9ff441e0e2a9a6b… (technical-description)
- github.com/guchengwuyue/yshop-crm/blob/a77250f7ace63d5b6b363841d9ff441e0e2a9a6b… (technical-description)
- www.vulncheck.com/advisories/yshop-crm-through-2.1.3-missing-authorization-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109171?
- CVE-2026-109171 is a medium-severity vulnerability in Guchengwuyue Yshop-Crm, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-12.
- How severe is CVE-2026-109171?
- Medium severity. CVSS v3 base score is 4.3 out of 10.