medium5.5
CVE-2026-48991
XianYuLauncher is a Minecraft Java Edition launcher.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Versions | before 1.5.5 |
Versions were read from the advisory text. No structured product data has been published for this record yet.