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    2 vulnerabilities by XianYuLauncher

    CVE-2026-48991 (GCVE-0-2026-48991)

    Vulnerability from nvd – Published: 2026-06-17 21:32 – Updated: 2026-06-18 12:55
    VLAI
    Title
    XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation
    Summary
    XianYuLauncher is a Minecraft Java Edition launcher. In versions prior to 1.5.5, sensitive authentication artifacts could be exposed during a user-initiated login under certain local attack conditions. Affected versions relied on a fixed localhost redirect URI without PKCE or state validation. Exploitation is most likely to occur when an attacker is able to observe, intercept, or otherwise interfere with the local authentication flow on the same device. This issue has been fixed in version 1.5.5.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-287 - Improper Authentication
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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                "id": "CVE-2026-48991",
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                "timestamp": "2026-06-18T12:54:05.147617Z",
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        "title": "CISA ADP Vulnrichment"
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    ],
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            }
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
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        },
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      "title": "XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation"
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    CVE-2026-48991 (GCVE-0-2026-48991)

    Vulnerability from cvelistv5 – Published: 2026-06-17 21:32 – Updated: 2026-06-18 12:55
    VLAI
    Title
    XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation
    Summary
    XianYuLauncher is a Minecraft Java Edition launcher. In versions prior to 1.5.5, sensitive authentication artifacts could be exposed during a user-initiated login under certain local attack conditions. Affected versions relied on a fixed localhost redirect URI without PKCE or state validation. Exploitation is most likely to occur when an attacker is able to observe, intercept, or otherwise interfere with the local authentication flow on the same device. This issue has been fixed in version 1.5.5.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-287 - Improper Authentication
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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      }
    ],
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          "vendor": "XianYuLauncher",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
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