CVE-2021-4461
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.
No affected software listed.
- https://github.com/chaitin/xray/blob/f90cf321bc4d294bbf6625a9c4853f3bfdf0a384/pocs/seeyon-oa-cookie-leak.yml
- https://github.com/projectdiscovery/nuclei-templates/blob/1ca6b8e6fe225cbd46dcb893dcaee01447afa8c0/http/misconfiguration/seeyon-unauth.yaml#L20
- https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresg
- https://www.vulncheck.com/advisories/seeyon-zhiyuan-oa-web-application-system-authentication-bypass
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