Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Talishar | Talishar | < 2026-02-22 |
Related Weaknesses (CWE)
References
- https://github.com/Talishar/Talishar/commit/a9c218efa37756c9e7eed056fbff6ee03f79Patch
- https://github.com/Talishar/Talishar/security/advisories/GHSA-2659-p579-wv83ExploitVendor Advisory
FAQ
What is CVE-2026-28428?
CVE-2026-28428 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 perf...
How severe is CVE-2026-28428?
CVE-2026-28428 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28428?
Check the references section above for vendor advisories and patch information. Affected products include: Talishar Talishar.