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CVE-2026-49446 is an authentication bypass vulnerability in Cosmos-Server affecting the Constellation tunnel path. The flaw allows forward-auth header smuggling through Cosmos identity headers, including user identity headers, during Constellation handling. As a result, attacker-supplied identity information can be accepted in a way that bypasses normal Cosmos authentication controls. The issue permits bypass of JWT-based login, password, and MFA protections, and can also defeat admin-only authorization checks on proxied backends when those backends trust Cosmos forward-auth headers for identity and access decisions.
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