Seeyon Zhiyuan OA Web Application System < 7.0 SP1 Authentication Bypass
50Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck.
ssvc Actcvss 9.3epss 0.6%
from disclosure to weapon
Published on NVDOct 30
VulnCheckOct 30
exploitation probability
0.6%top 53% of all CVEs
observed exploitation
yesVulnCheck
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.
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
Affected products
Seeyon · Zhiyuan OA Web Application SystemReferences
https://github.com/chaitin/xray/blob/f90cf321bc4d294bbf6625a9c4853f3bfdf0a384/pocs/seeyon-oa-cookie-leak.ymlhttps://github.com/projectdiscovery/nuclei-templates/blob/1ca6b8e6fe225cbd46dcb893dcaee01447afa8c0/http/misconfiguration/seeyon-unauth.yaml#L20https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresghttps://www.vulncheck.com/advisories/seeyon-zhiyuan-oa-web-application-system-authentication-bypass