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

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Summary

CVECVE-2026-28428
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-06 05:16:31 UTC
Updated2026-04-20 12:57:06 UTC
DescriptionTalishar 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-287 | CWE-287 CWE-287: Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Talishar Talishar All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Talishar Talishar affected < a9c218efa37756c9e7eed056fbff6ee03f79aefc Not specified

References

ReferenceSourceLinkTags
github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83 [email protected] github.com Exploit, Vendor Advisory
github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79... [email protected] github.com Patch
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