CVE-2021-4461
Seeyon Zhiyuan OA Web Application System < 7.0 SP1 Authentication Bypass
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 30, 2025
- Updated
- Nov 28, 2025
- Reserved
- Oct 30, 2025
Description
Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the `enc` parameter in thirdpartyController.do. The decoded map values can influence session attributes without sufficient authentication/authorization checks, enabling attackers to assign a session to arbitrary user IDs. VulnCheck has observed this vulnerability being exploited in the wild as of 2025-10-30 at 00:30:40.855917 UTC.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
Zhiyuan OA Web Application SystemSeeyon |
|
References
- https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresgexploit
- https://github.com/chaitin/xray/blob/f90cf321bc4d294bbf6625a9c4853f3bfdf0a384/pocs/seeyon-oa-cookie-leak.ymlexploit
- https://github.com/projectdiscovery/nuclei-templates/blob/1ca6b8e6fe225cbd46dcb893dcaee01447afa8c0/http/misconfiguration/seeyon-unauth.yaml#L20exploit
- https://www.vulncheck.com/advisories/seeyon-zhiyuan-oa-web-application-system-authentication-bypassthird-party-advisory
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