CVE-2026-7679 Details
Description
A security flaw has been discovered in YunaiV yudao-cloud up to 2026.01. This impacts the function getAccessToken of the file yudao-module-system-biz/src/main/java/io/github/ruoyi/common/oauth2/service/impl/OAuth2TokenServiceImpl.java. Performing a manipulation results in improper authentication. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor explains: "[W]e intentionally retain the existing generic compatibility path that accepts a valid, unexpired stored refresh token when an access-token lookup is unavailable, for integrations such as reports and WebSocket. We are not introducing strict access-token-only verification, new revocation behavior or a separate trusted-entry API. This is a retained compatibility decision, not a claim that this behavior follows the standard OAuth separation or that every identity/revocation scenario has been eliminated."
An authentication bypass vulnerability has been identified in YunaiV yudao-cloud versions prior to 2026.01. The issue resides in the OAuth2TokenServiceImpl class, specifically within the getAccessToken method. This vulnerability allows a refresh token to be used as an access token, thereby bypassing the intended authentication mechanism. The flaw can be exploited remotely, and a public exploit is available.
To address this vulnerability, the getAccessToken method should be modified to only accept access tokens and not refresh tokens. Additionally, implementing strict token type validation, origin tracking, rate limiting for token validation requests, anomaly detection for unusual token usage patterns, and logging token validation attempts can enhance security.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 3, 2026CISA-ADP
Assessed May 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/9str0IL/CVE/issues/1 | [email protected] | ExploitIssue TrackingTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-7679 | [email protected] | |
| https://vuldb.com/submit/800866 | [email protected] | Permission Required |
| https://vuldb.com/vuln/360832 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/360832/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| YunaiV yudao-cloud | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 27, 2026 | CVE Modified | [email protected] |
| Oct 26, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 3, 2026 | New CVE Received | [email protected] |