CVE-2026-28428

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.

• CWE-287

• https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79aefcPatch
• https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83Exploit, Vendor Advisory

Published

Mar 6, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-28422Vim is an open source, command line text editor. Prior to ve…2.2
• CVE-2026-28423Statmatic is a Laravel and Git powered content management sy…8.6
• CVE-2026-28424Statmatic is a Laravel and Git powered content management sy…6.5
• CVE-2026-28425Statmatic is a Laravel and Git powered content management sy…8
• CVE-2026-28426Statmatic is a Laravel and Git powered content management sy…5.4
• CVE-2026-28427OpenDeck is Linux software for your Elgato Stream Deck. Prio…7.5
• CVE-2026-28429Talishar is a fan-made Flesh and Blood project. Prior to com…7.5
• CVE-2026-28430Chamilo LMS is a learning management system. Prior to versio…9.8
• CVE-2026-28431Misskey is an open source, federated social media platform. …7.5
• CVE-2026-28432Misskey is an open source, federated social media platform. …7.5
• CVE-2026-28433Misskey is an open source, federated social media platform. …4.3
• CVE-2026-28434cpp-httplib is a C++11 single-file header-only cross platfor…5.3