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CVE-2021-4461— Seeyon Zhiyuan OA Web Application System < 7.0 SP1 Authentication Bypass

Quick assessment

Affected
Seeyon Zhiyuan OA Web Application System
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Seeyon Zhiyuan OA Web Application System是中国致远（Seeyon）公司的一款综合办公自动化平台。 Seeyon Zhiyuan OA Web Application System 7.0 SP1及之前版本存在安全漏洞，该漏洞源于对thirdpartyController.do中参数enc解码和解析不当，可能导致攻击者分配任意用户ID会话。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.49% · P40
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I. Basic Information for CVE-2021-4461

Vulnerability Information
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Vulnerability Title
Seeyon Zhiyuan OA Web Application System < 7.0 SP1 Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Seeyon Zhiyuan OA Web Application System 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Seeyon Zhiyuan OA Web Application System是中国致远（Seeyon）公司的一款综合办公自动化平台。 Seeyon Zhiyuan OA Web Application System 7.0 SP1及之前版本存在安全漏洞，该漏洞源于对thirdpartyController.do中参数enc解码和解析不当，可能导致攻击者分配任意用户ID会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Seeyon Zhiyuan OA Web Application System 0 ~ 7.0 SP1 -

II. Public POCs for CVE-2021-4461

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III. Intelligence Information for CVE-2021-4461

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Proof of Concept for CVE-2021-4461 (1)

IV. Related Vulnerabilities

Same product: Zhiyuan OA Web Application System
Same vendor: Seeyon
Same weakness: CWE-306

V. Comments for CVE-2021-4461

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