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CVE-2026-45057 affects the Rust crate matrix-sdk-ui before version 0.16.1. The flaw is in the message edit validation logic for Matrix replacement events: when an encrypted event is replaced, the SDK did not enforce that the replacement event was also encrypted. This incomplete validation allows a crafted unencrypted replacement event to be accepted in place of an encrypted original event, contrary to the expected validation rules for encrypted message edits. As a result, a malicious homeserver administrator, or another actor with equivalent control over event delivery or modification, can cause clients using vulnerable versions of matrix-sdk-ui to display spoofed edited messages as though they were authored by the victim user.
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