CVE-2026-48991

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Source
https://cve.org/CVERecord?id=CVE-2026-48991
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48991.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-48991
Aliases
  • GHSA-q6r9-qxmf-8hfx
Published
2026-06-17T21:32:41.402Z
Modified
2026-07-08T08:14:40.364975914Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48991.json",
    "cwe_ids": [
        "CWE-287"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/xianyulauncher/xianyulauncher

Affected ranges

Type
GIT
Repo
https://github.com/xianyulauncher/xianyulauncher
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
479ce3b3ce8162f5673be09e9be7c48cfbbab54f
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.5.5"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

b1.*
b1.3.1.1
b1.3.1.2
v1.*
v1.3.2
v1.3.3
v1.3.4
v1.3.4.1
v1.3.5
v1.3.6
v1.3.7
v1.3.8
v1.4.0
v1.4.1
v1.4.1-dev01
v1.4.1-dev02
v1.4.1-dev03
v1.4.1-dev04
v1.4.1-dev05
v1.4.1-dev06
v1.4.2
v1.4.2-dev00
v1.4.2-dev01
v1.4.2-dev02
v1.4.2-dev03
v1.4.2-dev04
v1.4.2-dev05
v1.4.2-dev06
v1.4.2-dev07
v1.4.3
v1.4.3-dev00
v1.4.3-dev01
v1.4.3-dev02
v1.4.4
v1.4.4-dev00
v1.4.5-dev00
v1.4.5-dev01
v1.4.5-dev02
v1.4.5-dev03
v1.5.0
v1.5.1
v1.5.1-dev00
v1.5.1-dev01
v1.5.1-dev02
v1.5.1-dev03
v1.5.1-dev04
v1.5.1-dev05
v1.5.2
v1.5.2-dev00
v1.5.2-dev01
v1.5.2-dev02
v1.5.3
v1.5.3-dev00
v1.5.4
v1.5.4-dev00

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48991.json"