A flaw has been found in OpenClaw up to 2026.9.5. Affected is the function createCanvasHostHandler of the file extensions/canvas/src/host/server.ts of the component Canvas Host Route. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been published and may be used. Fix suggestion's "streaming/size-limit" was never shipped - latest 2026.9.5 still buffers the whole file via readFile() (src/canvas/serve.runtime.ts:17,114), unlike the sibling WS path which caps at 64KB. The vendor was contacted early about this disclosure.

OpenClaw versions before 2026.6.1 contain a credential redaction bypass vulnerability in the trajectory export feature that allows lower-trust callers to access data that should remain within trusted boundaries. Attackers can exploit misconfigured input paths or feature accessibility to expose sensitive credentials and data through the export mechanism.

OpenClaw versions before 2026.6.1 contain a denial of service vulnerability where remote media URLs can trigger slow-read attacks that exhaust gateway worker resources. Attackers with access to configured input paths can supply remote media URLs that consume gateway resources and reduce availability.

OpenClaw versions 2026.6.1 before 2026.6.9 contain a privilege escalation vulnerability in isolated cron jobs that allows lower-trust callers to regain denied execution tools. Attackers can execute or persist actions beyond their intended authorization by leveraging misconfigured input paths in the affected cron feature.

OpenClaw versions 2026.4.12-beta.1 before 2026.6.6 contain a missing-authorization vulnerability in the MS Teams message actions feature. When the affected feature is enabled and reachable, a lower-trust caller or a configured input path can perform actions that should have required a stronger authorization or policy check. Practical impact depends on the operator's configuration and whether lower-trust input can reach that path. The issue is fixed in 2026.6.6.

OpenClaw 2026.3.28 before 2026.5.19 contain an authorization bypass vulnerability in the browser act route that fails to properly validate current-tab URL checks. Attackers with lower-trust access or configured input paths can perform actions requiring stronger authorization or policy checks.

OpenClaw before 2026.6.5 could forward Authorization headers during MCP SSE redirects. When the affected feature is enabled and reachable, a lower-trust caller or configured input path could execute or persist actions beyond the caller's intended authorization. Impact depends on the operator's configuration and whether lower-trust input can reach the affected path.

OpenClaw before 2026.5.18 contain an authorization bypass vulnerability in the device-pair approval feature that allows lower-trust callers to execute actions beyond their intended authorization. Attackers can exploit misconfigured input paths to execute or persist unauthorized actions when the affected feature is enabled and reachable.

OpenClaw versions before 2026.6.6 contain a network policy bypass vulnerability in the sandbox exec-server that allows lower-trust callers to reach internal network destinations blocked by OpenClaw policy. Attackers can send HTTP requests through the exec-server to access network resources that should have been restricted by configured policies.

OpenClaw before 2026.5.28 contains a race condition in the MS Teams safeFetch DNS rebinding check. When the affected feature is enabled and reachable, a lower-trust caller or configured input path could win a timing window between the DNS validation check and use, allowing actions that should have required a stronger authorization or policy check. Practical impact depends on the operator's configuration and whether lower-trust input can reach that path.