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    4 vulnerabilities by GeyserMC

    CVE-2026-42188 (GCVE-0-2026-42188)

    Vulnerability from nvd – Published: 2026-05-11 21:25 – Updated: 2026-05-13 14:39
    VLAI
    Title
    Geyser: Server-Side Request Forgery (SSRF) via Player Head Texture URL
    Summary
    Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Prior to 2.9.3, a server-side request forgery (SSRF) vulnerability exists in Geyser’s handling of Bedrock player head texture data. By supplying a crafted Base64-encoded skin texture URL via the /give command, an attacker can cause the Minecraft server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side, without proper URL validation, and can be triggered by a Bedrock client. This vulnerability is fixed in 2.9.3.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Vendor Product Version
    GeyserMC Geyser Affected: < 2.9.3
    Create a notification for this product.
    Show details on NVD website

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    CVE-2021-39177 (GCVE-0-2021-39177)

    Vulnerability from nvd – Published: 2021-08-30 23:00 – Updated: 2024-08-04 01:58
    VLAI
    Title
    User impersonation due to incorrect handling of the login JWT
    Summary
    Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading.
    CWE
    • CWE-287 - Improper Authentication
    Assigner
    Impacted products
    Vendor Product Version
    GeyserMC Geyser Affected: <= 1.4.1-SNAPSHOT
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-42188 (GCVE-0-2026-42188)

    Vulnerability from cvelistv5 – Published: 2026-05-11 21:25 – Updated: 2026-05-13 14:39
    VLAI
    Title
    Geyser: Server-Side Request Forgery (SSRF) via Player Head Texture URL
    Summary
    Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Prior to 2.9.3, a server-side request forgery (SSRF) vulnerability exists in Geyser’s handling of Bedrock player head texture data. By supplying a crafted Base64-encoded skin texture URL via the /give command, an attacker can cause the Minecraft server to issue arbitrary HTTP GET requests to attacker-controlled or internal endpoints. This occurs server-side, without proper URL validation, and can be triggered by a Bedrock client. This vulnerability is fixed in 2.9.3.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Vendor Product Version
    GeyserMC Geyser Affected: < 2.9.3
    Create a notification for this product.
    Show details on NVD website

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    CVE-2021-39177 (GCVE-0-2021-39177)

    Vulnerability from cvelistv5 – Published: 2021-08-30 23:00 – Updated: 2024-08-04 01:58
    VLAI
    Title
    User impersonation due to incorrect handling of the login JWT
    Summary
    Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading.
    CWE
    • CWE-287 - Improper Authentication
    Assigner
    Impacted products
    Vendor Product Version
    GeyserMC Geyser Affected: <= 1.4.1-SNAPSHOT
    Create a notification for this product.
    Show details on NVD website

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                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "Geyser",
                          "version": {
                            "version_data": [
                              {
                                "version_value": "\u003c= 1.4.1-SNAPSHOT"
                              }
                            ]
                          }
                        }
                      ]
                    },
                    "vendor_name": "GeyserMC"
                  }
                ]
              }
            },
            "data_format": "MITRE",
            "data_type": "CVE",
            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "Geyser is a bridge between Minecraft: Bedrock Edition and Minecraft: Java Edition. Versions of Geyser prior to 1.4.2-SNAPSHOT allow anyone that can connect to the server to forge a LoginPacket with manipulated JWT token allowing impersonation as any user. Version 1.4.2-SNAPSHOT contains a patch for the issue. There are no known workarounds aside from upgrading."
                }
              ]
            },
            "impact": {
              "cvss": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              }
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "CWE-287: Improper Authentication"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858",
                  "refsource": "CONFIRM",
                  "url": "https://github.com/GeyserMC/Geyser/security/advisories/GHSA-h77f-xxx7-4858"
                },
                {
                  "name": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6",
                  "refsource": "MISC",
                  "url": "https://github.com/GeyserMC/Geyser/commit/b9541505af68ac7b7c093206ac7b1ba88957a5a6"
                },
                {
                  "name": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY",
                  "refsource": "MISC",
                  "url": "https://updates.playhive.com/weekend-maintenance-disclosure-2kJMaY"
                }
              ]
            },
            "source": {
              "advisory": "GHSA-h77f-xxx7-4858",
              "discovery": "UNKNOWN"
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2021-39177",
        "datePublished": "2021-08-30T23:00:12.000Z",
        "dateReserved": "2021-08-16T00:00:00.000Z",
        "dateUpdated": "2024-08-04T01:58:18.223Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }