CVE-2026-2146
Published: 08 February 2026
Summary
CVE-2026-2146 is a medium-severity Improper Access Control (CWE-284) vulnerability in Guchengwuyue Yshopmall. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Web Shell (T1100); ranked at the 6.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control enforces ownership-based restrictions on portable storage device use, directly implementing access control over media insertion into organizational systems.
Hardware write-protect enforces access control on critical resources (e.g., firmware) independent of software state.
The access control policy and procedures directly mandate and enforce proper access control mechanisms across the organization.
Device lock enforces restricted access until re-authentication, directly reducing unauthorized use of active sessions.
Supervision and review of access control activities directly detects and remediates improper access configurations or usages.
Explicitly identifying and documenting actions permitted without identification or authentication enforces proper access control boundaries by defining justified exceptions.
By automatically labeling outputs with security attributes, the control supports attribute-based enforcement and reduces exploitability of improper access control weaknesses.
Associating and retaining security attributes with data directly supports enforcement of access control decisions across storage, processing, and transmission.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unrestricted file upload (CWE-434) directly enables deployment of web shells on the server via the exposed API endpoint.
NVD Description
A security flaw has been discovered in guchengwuyue yshopmall up to 1.9.1. This affects the function updateAvatar of the file /api/users/updateAvatar of the component co.yixiang.utils.FileUtil. Performing a manipulation of the argument File results in unrestricted upload. The attack is possible…
more
to be carried out 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.
Deeper analysisAI
CVE-2026-2146 is an unrestricted file upload vulnerability affecting guchengwuyue yshopmall versions up to 1.9.1. The flaw resides in the updateAvatar function within the /api/users/updateAvatar endpoint of the co.yixiang.utils.FileUtil component. By manipulating the File argument, attackers can upload arbitrary files remotely, as documented in the CVE description with associated CWEs-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type). The vulnerability carries a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).
The attack requires low privileges (PR:L), meaning an authenticated user with basic access can exploit it over the network with low complexity and no user interaction. Successful exploitation allows limited impacts on confidentiality, integrity, and availability, primarily through the upload of potentially malicious files that could lead to further compromise depending on server configuration and file handling.
Advisories from VulDB (ctiid.344848 and id.344848) and GitHub issue #40 in the yshopmall repository detail the issue, noting that the project was informed early via an issue report but has not responded or released patches as of the CVE publication on 2026-02-08. No official mitigations or fixes are available, so practitioners should restrict access to the affected endpoint, validate file uploads strictly, and monitor for exploit attempts.
Notably, a public exploit has been released, increasing the risk of active attacks against unpatched instances.
Details
- CWE(s)