CVE-2026-7679: Medium Vulnerability in YunaiV yudao-cloud

A security flaw has been discovered in YunaiV yudao-cloud up to 2026.01. This vulnerability allows improper authentication through a manipulation of the function getAccessToken in the file yudao-module-system-biz/src/main/java/io/github/ruoyi/common/oauth2/service/impl/OAuth2TokenServiceImpl.java. The attack can be initiated remotely, which increases its exploitation potential. The exploit has been released to the public, enabling attackers to leverage this flaw for malicious purposes. Despite early disclosure to the vendor, no response was received.

The CVSS score for this vulnerability is 5.5, categorized as medium severity. Organizations must assess their exposure and prioritize patching to address this issue promptly. Risk to organizations includes unauthorized access to sensitive systems due to improper authentication. Potential impacts of exploitation include data integrity and availability issues.

Given the nature of this vulnerability and its medium CVSS score, organizations should address it in their priority patch cycle. As there is no known public exploit confirmed at this time, the urgency for remediation remains high to prevent any unauthorized access.

In summary, organizations utilizing YunaiV yudao-cloud should be vigilant in monitoring and remediating this vulnerability to safeguard their systems against potential exploitation.

Vulnerability Details

This vulnerability allows improper authentication due to a flaw in the OAuth2 token service implementation. The CVSS vector string is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X, indicating that the attack can occur over a network with low complexity and does not require user interaction.

The CWE classification associated with this vulnerability is CWE-287, which pertains to improper authentication. Organizations should be aware of the potential risks and impacts associated with this vulnerability.

Technical Analysis

The root cause of this vulnerability stems from inadequate validation of authentication tokens, which can lead to unauthorized access. The attack vector is network-based, allowing attackers to exploit the vulnerability remotely without requiring any privileges or user interaction.

The attack complexity is low, meaning that an attacker can easily exploit this vulnerability with minimal effort. The confidentiality, integrity, and availability impacts are all rated as low, indicating that while the risk is present, the scale of potential damage is relatively contained.

Risk & Impact Analysis

Real-world deployment risk for this vulnerability is significant, especially for organizations that rely on YunaiV yudao-cloud for their operations. Attackers may leverage this flaw to gain unauthorized access, potentially leading to data loss or corruption.

The blast radius for this vulnerability can vary based on the organization's reliance on the affected service. Organizations should assess their exposure and prioritize patching accordingly.

Based on the CVSS score and the known exploitation status, organizations should address this vulnerability in their priority patch cycle to mitigate potential risks.

Exploitation Status

Affected Versions

All versions prior to vendor patch are affected. Organizations should ensure they are running the latest version of YunaiV yudao-cloud to mitigate this risk.

Mitigation & Remediation

Organizations should prioritize patching to the latest version of YunaiV yudao-cloud to address this vulnerability. If a patch is unavailable, consider implementing the following workarounds: restricting access to the affected service, enabling logging and monitoring to detect unauthorized access attempts, and reviewing authentication mechanisms for additional security.

For thorough validation of remediation efforts, organizations may engage in penetration testing services that can help identify similar weaknesses.

Detection Guidance

To detect potential exploitation of this vulnerability, organizations should monitor for unusual access patterns and authentication failures in their logs. Behavioral anomalies that deviate from normal activity should be investigated promptly.

AppSecure Threat Intelligence Insight

This vulnerability highlights the importance of robust authentication mechanisms and the need for timely responses to security disclosures. Security teams should learn from this incident to enhance their defensive posture and consider regular assessments of their application security.

Organizations can benefit from a comprehensive vulnerability management program that identifies and mitigates risks proactively.

Additionally, adopting an effective penetration testing methodology can further enhance security against potential threats.

In conclusion, the lessons learned from this vulnerability underscore the necessity of continuous security improvement and awareness of evolving threats.