CVE-2026-28428 (GCVE-0-2026-28428)
Vulnerability from cvelistv5 – Published: 2026-03-06 04:59 – Updated: 2026-03-09 19:54
VLAI
EPSS
VEX
Title
Talishar: Authentication Bypass via Empty authKey Parameter Allows Unauthenticated Game Actions
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-09 19:54 UTC
CWE
- CWE-287 - Improper Authentication
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Talishar/Talishar/security/adv… | x_refsource_CONFIRM |
| https://github.com/Talishar/Talishar/commit/a9c21… | x_refsource_MISC |
Impacted products
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Sightings
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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