CVE-2021-39177 — User impersonation due to incorrect handling of the login JWT
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 forg…
Published: 2021-08-30 · CVSS: 7.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7