EUVD-2026-83650
GHSA-7f9q-8hrr-q8pw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote unauthenticated low-complexity access to a public API endpoint (AV:N/AC:L/PR:N/UI:N); impact is limited to a username-existence oracle, so C:L and I/A:N.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
1DescriptionCVE.org
A security flaw has been discovered in Dromara UJCMS up to 12.3.1. The affected element is the function usernameExist of the file ujcms-cms/src/main/java/com/ujcms/cms/core/web/api/UserController.java of the component UserController. Performing a manipulation of the argument Username results in improper authorization. It is possible to initiate the attack remotely. The project was informed of the problem early through an issue report but has not responded yet.
AnalysisAI
Unauthenticated username enumeration in Dromara UJCMS through version 12.3.1 allows remote attackers to query the UserController username-existence endpoint and determine whether a given account name is registered on the target site, leaking account information without any credentials, user interaction, or special configuration. The independent assessment rates this as a low-impact confidentiality leak (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N), whose practical value lies in feeding follow-on password-guessing or credential-stuffing campaigns against confirmed accounts rather than in direct compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires that the UJCMS REST API (the UserController usernameExist endpoint) is reachable by the attacker - the default in a network-exposed deployment. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mostly low-to-moderate and internally consistent. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Status: no vendor-released patch identified at time of analysis - the issue was reported early to the project via https://github.com/dromara/ujcms/issues/22 and, per the report, the project has not responded, so no fixed version number can be cited (do not assume a later 12.x release is fixed without vendor confirmation; monitor https://github.com/dromara/ujcms/ and the issue thread for an official release). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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