{"id":"CVE-2026-28428","state":"PUBLISHED","title":"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.","publishedAt":"2026-03-06T04:59:52.271Z","updatedAt":"2026-03-09T19:54:28.169Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["Talishar Talishar"],"affected":[{"vendor":"Talishar","product":"Talishar","versions":[{"version":"< a9c218efa37756c9e7eed056fbff6ee03f79aefc","status":"affected"}]}],"references":["https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83","https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79aefc"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/28xxx/CVE-2026-28428.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-28428","state":"PUBLISHED","datePublished":"2026-03-06T04:59:52.271Z","dateUpdated":"2026-03-09T19:54:28.169Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-27T15:54:05.137Z"},"containers":{"cna":{"title":"Talishar: Authentication Bypass via Empty authKey Parameter Allows Unauthenticated Game Actions","descriptions":[{"lang":"en","value":"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":[{"vendor":"Talishar","product":"Talishar","versions":[{"version":"< a9c218efa37756c9e7eed056fbff6ee03f79aefc","status":"affected"}]}],"references":[{"url":"https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83","name":"https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79aefc","name":"https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79aefc","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-06T04:59:52.271Z"},"source":{"advisory":"GHSA-2659-p579-wv83","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-09T19:54:17.946170Z","id":"CVE-2026-28428","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-09T19:54:28.169Z"}}]}}}