Vulnerability · CVE-2021-4461
seeyon zhiyuan_oa_web_application_system Missing Authentication for Critical Function
Published Oct 30, 2025 · corrected/updated Oct 30, 2025 · seeyon zhiyuan_oa_web_application_system · evidence confidence very high
Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the 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. VulnCheck canary evidence.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2021-4461 is a unknown public vulnerability record for seeyon zhiyuan_oa_web_application_system. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether seeyon zhiyuan_oa_web_application_system is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: seeyon zhiyuan_oa_web_application_system. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: no CVSS/EPSS yet. CISA lists it as known exploited. Sources contributing to this record: cve_org, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Oct 30, 2025. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 30, 2025 · VulnCheck KEV
Detected
Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the 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 20
Oct 30, 2025 · CISA KEV
Known exploited
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected
- vendor seeyon zhiyuan_oa_web_application_systemversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2021-4461
Official CVE identifier
cve.org - VulnCheck KEVConfirmed exploitationCVE-2021-4461
Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1 improperly decode and parse the parameter in thirdpartyController.do. The decoded map values can influence session attributes without sufficient authentication/authorization checks, enabling attackers t
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