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CVE-2026-49455 is a cross-origin request forgery vulnerability in Waku's React Server Components (RSC) server action dispatch mechanism. The issue allows authenticated cross-origin POST requests to reach registered "use server" action endpoints without proper Origin validation. As a result, a malicious site can induce a victim's browser to submit POST requests to Waku server action endpoints while automatically including the victim's session cookies, causing server-side actions to execute in the victim's authenticated context. The vulnerable condition is specifically the absence of effective Origin checking on POST requests to the server action dispatch path, including deployments using the configured rscBase prefix.
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