Deficient state resolution in Matrix before 1.16
CVE-2025-49090 affects the Matrix specification before version 1.16. According to the provided content, Matrix deployments using a room version before 12 and State Resolution before 2.1 are affected by deficient state resolution. This indicates a flaw in how Matrix resolves conflicting room state across events/servers under older room-version and state-resolution rules. The provided material does not include function-level or implementation-level details beyond identifying the issue as deficient state resolution in the specification.
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