github - ghsa-vjp9-58v6-m6fw

GHSA-VJP9-58V6-M6FW

Vulnerability from github – Published: 2025-10-31 00:30 – Updated: 2025-10-31 00:30

Details

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.

Severity ?

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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-4461"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-30T22:15:41Z",
    "severity": "CRITICAL"
  },
  "details": "Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1\u00a0improperly 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.",
  "id": "GHSA-vjp9-58v6-m6fw",
  "modified": "2025-10-31T00:30:32Z",
  "published": "2025-10-31T00:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4461"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chaitin/xray/blob/f90cf321bc4d294bbf6625a9c4853f3bfdf0a384/pocs/seeyon-oa-cookie-leak.yml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectdiscovery/nuclei-templates/blob/1ca6b8e6fe225cbd46dcb893dcaee01447afa8c0/http/misconfiguration/seeyon-unauth.yaml#L20"
    },
    {
      "type": "WEB",
      "url": "https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresg"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/seeyon-zhiyuan-oa-web-application-system-authentication-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2021-4461 (GCVE-0-2021-4461)

Vulnerability from cvelistv5 – Published: 2025-10-30 21:16 – Updated: 2025-11-28 19:17 X_Known Exploited Vulnerability

Title

Seeyon Zhiyuan OA Web Application System < 7.0 SP1 Authentication Bypass

Summary

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.

Severity ?

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

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

VulnCheck

References

URL

Tags

	https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresg	exploit
	https://github.com/chaitin/xray/blob/f90cf321bc4d…	exploit
	https://github.com/projectdiscovery/nuclei-templa…	exploit
	https://www.vulncheck.com/advisories/seeyon-zhiyu…	third-party-advisory

Impacted products

	Vendor	Product	Version
	Seeyon	Zhiyuan OA Web Application System	Affected: 0 , ≤ 7.0 SP1 (custom)

Credits

Anonymous User via WeChat

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-4461",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-11-28T19:16:58.418427Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-11-28T19:17:19.543Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "thirdpartyController.do \u2013 `enc` parameter decoding (LightWeightEncoder) and parsing"
          ],
          "product": "Zhiyuan OA Web Application System",
          "vendor": "Seeyon",
          "versions": [
            {
              "lessThanOrEqual": "7.0 SP1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:seeyon:zhiyuan_oa_web_application_system:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "7.0_sp1",
                  "versionStartIncluding": "0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "OR"
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Anonymous User via WeChat"
        }
      ],
      "descriptions": [
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          "supportingMedia": [
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            }
          ],
          "value": "Seeyon Zhiyuan OA Web Application System versions up to and including 7.0 SP1\u00a0improperly 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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      "references": [
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          "url": "https://mp.weixin.qq.com/s/0AqdfTrZUVrwTMbKEKresg"
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        },
        {
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        },
        {
          "tags": [
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        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
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    "cveId": "CVE-2021-4461",
    "datePublished": "2025-10-30T21:16:23.161Z",
    "dateReserved": "2025-10-30T20:08:37.632Z",
    "dateUpdated": "2025-11-28T19:17:19.543Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VJP9-58V6-M6FW

CVE-2021-4461 (GCVE-0-2021-4461)

Tags

Sightings

Nomenclature