CVE-2026-33978: Worker Untrusted Client Id Registration
Client identifiers extracted from worker message event payloads (`event.data.clientId`) are self-reported and untrusted. Using `event.data.clientId` to register or route MessagePorts allows untrusted contexts to spoof client IDs and hijack inter-context communication. Rely on browser-verified context identifiers such as `event.source.id` in ServiceWorkers in
TSgreprules fetch cve-2026-33978-worker-untrusted-client-id-registration --engine opengrepDescription
Client identifiers extracted from worker message event payloads (`event.data.clientId`) are self-reported and untrusted. Using `event.data.clientId` to register or route MessagePorts allows untrusted contexts to spoof client IDs and hijack inter-context communication. Rely on browser-verified context identifiers such as `event.source.id` in ServiceWorkers in
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