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5.5

Minecraft Java Edition Launcher Exposes Login Info on Same Device

CVE-2026-48991 · published 4 months ago
Summary

Versions of the Minecraft Java Edition launcher before 1.5.5 may leak sensitive login information when an attacker is on the same device as the user. This means an attacker could see your login credentials if they have access to the same device. To fix this, update to version 1.5.5 or later.

Original advisory text
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 conditi...
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
5.5 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-287Improper Authentication
Timeline
Published17 Jun 2026
Updated26 Oct 2026
First seen17 Jun 2026
Sources
CVE-2026-48991 · NVD
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