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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-28428

Talishar: Authentication Bypass via Empty authKey Parameter Allows Unauthenticated Game Actions

Description

Talishar is a fan-made Flesh and Blood project. Prior to commit a9c218e, an authentication bypass vulnerability in Talishar's game endpoint validation logic allows any unauthenticated attacker to perform authenticated game actions — including sending chat messages and submitting game inputs — by supplying an empty authKey parameter (authKey=). The server-side validation uses a loose comparison that accepts an empty string as a valid credential, while correctly rejecting non-empty but incorrect keys. This asymmetry means the authentication mechanism can be completely bypassed without knowing any valid token. This issue has been patched in commit a9c218e.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Talishar Talishar

  • < a9c218efa37756c9e7eed056fbff6ee03f79aefcaffected

References