{"id":"CVE-2026-28428","summary":"Talishar: Authentication Bypass via Empty authKey Parameter Allows Unauthenticated Game Actions","details":"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.","aliases":["GHSA-2659-p579-wv83"],"modified":"2026-04-10T05:42:20.318132Z","published":"2026-03-06T04:59:52.271Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28428.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28428.json"},{"type":"FIX","url":"https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79aefc"},{"type":"ADVISORY","url":"https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28428"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/talishar/talishar","events":[{"introduced":"0"},{"fixed":"a9c218efa37756c9e7eed056fbff6ee03f79aefc"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28428.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}