YunaiV yudao-cloud Authentication Bypass (CVE-2026-7679) Publicly Exploited
A critical authentication bypass vulnerability, tracked as CVE-2026-7679, has been identified in YunaiV yudao-cloud versions up to 2026.01. The National Vulnerability Database reports this flaw resides within the getAccessToken function of the OAuth2TokenServiceImpl.java file, part of the yudao-module-system-biz component. This vulnerability allows for improper authentication through remote manipulation, carrying a CVSSv3.1 score of 7.3 (HIGH).
The implications are significant: an attacker can bypass authentication mechanisms remotely, gaining unauthorized access. The National Vulnerability Database confirms that exploit code for CVE-2026-7679 has been publicly released, meaning active exploitation is highly probable. The vendor, YunaiV, has reportedly been unresponsive to disclosure attempts, leaving users in a precarious position.
This is a textbook case of a high-impact vulnerability with a clear attack path and public exploit availability. For defenders, this isn’t a theoretical risk; it’s an immediate threat. The attacker’s calculus here is simple: leverage a known, unpatched flaw with a public exploit to gain initial access, a critical first step in many complex attack chains.
What This Means For You
- If your organization uses YunaiV yudao-cloud, particularly versions up to 2026.01, you are immediately exposed. There is no patch available, and the exploit is public. You need to identify all instances of this software in your environment and evaluate immediate mitigation strategies, potentially isolating or removing the affected component if direct exposure is detected. Review access logs for any anomalous authentication attempts or unauthorized access.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
YunaiV Yudao-Cloud Authentication Bypass Attempt (CVE-2026-7679)
title: YunaiV Yudao-Cloud Authentication Bypass Attempt (CVE-2026-7679)
id: scw-2026-05-03-ai-1
status: experimental
level: high
description: |
This rule detects attempts to exploit CVE-2026-7679 by targeting the getAccessToken function in YunaiV yudao-cloud. It specifically looks for POST requests to '/oauth2/token' with a 'grant_type=password' parameter, which is indicative of the authentication bypass vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-05-03
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7679/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/oauth2/token'
cs-method:
- 'POST'
cs-uri-query|contains:
- 'grant_type=password'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7679 | Auth Bypass | YunaiV yudao-cloud up to version 2026.01 |
| CVE-2026-7679 | Auth Bypass | Vulnerable function: getAccessToken in yudao-module-system-biz/src/main/java/io/github/ruoyi/common/oauth2/service/impl/OAuth2TokenServiceImpl.java |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 03, 2026 at 08:15 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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