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OpenClaw before 2026.2.25 lacks durable replay state for Nextcloud Talk webhook events, allowing valid signed requests to be replayed. Attackers can capture and replay previously valid signed webhook requests to trigger duplicate inbound processing and cause integrity or availability issues.
AnalysisAI
OpenClaw before version 2026.2.25 fails to implement durable replay state validation for Nextcloud Talk webhook events, allowing attackers to capture and replay previously valid signed webhook requests to cause duplicate processing. This affects all versions of OpenClaw prior to the patched release, and an attacker with network access can exploit this vulnerability without authentication or user interaction to trigger integrity and availability impacts such as duplicate message processing or resource exhaustion.
Technical ContextAI
The vulnerability exists in OpenClaw's webhook handling mechanism for Nextcloud Talk integrations, specifically in the absence of cryptographic replay protection mechanisms (CWE-294: Improper Handling of Insufficient Cryptographic Entropy). While webhook requests are cryptographically signed to verify origin, the application lacks a durable replay state store (such as a nonce cache, timestamp validation window, or idempotency key tracking) to prevent the same signed payload from being processed multiple times. This is a protocol-level design flaw rather than a cryptographic weakness—the signatures themselves are valid; the problem is that valid signatures are treated as sufficient proof of authenticity without considering whether the exact same request has already been processed. The affected product is OpenClaw (CPE: cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:*:*:*), a webhook integration platform for Nextcloud Talk.
RemediationAI
Upgrade OpenClaw to version 2026.2.25 or later immediately, which includes fixes to implement durable replay state validation for webhook events. The patched commit (d512163d686ad6741783e7119ddb3437f493dbbc) is available on the OpenClaw GitHub repository. Until patching is completed, implement network-level mitigations including: restrict webhook ingestion to trusted Nextcloud Talk server IP ranges using firewall rules; enforce TLS 1.2 or higher for all webhook transport; monitor webhook processing logs for anomalous duplicate activity patterns; and consider implementing a temporary reverse proxy with request deduplication based on cryptographic request fingerprinting (hash of signature plus timestamp). See the vendor advisory at https://github.com/openclaw/openclaw/security/advisories/GHSA-r9q5-c7qc-p26w for complete remediation guidance.
Auth bypass in OpenClaw voice-call extension before 2026.2.1. EPSS 0.68%. PoC and patch available.
Privilege escalation in OpenClaw (pre-2026.3.28) allows unauthenticated remote attackers to gain administrative access b
OpenClaw versions 2026.2.22 through 2026.2.24 contain a privilege escalation vulnerability that allows authenticated att
An authorization mismatch vulnerability in OpenClaw versions prior to 2026.3.1 allows authenticated users with operator.
OpenClaw versions prior to 2026.1.29 automatically establish WebSocket connections to attacker-controlled gateway URLs e
Path traversal in OpenClaw through version 2026.3.23 enables unauthenticated remote attackers to read arbitrary files in
OpenClaw sandbox browser functionality launches x11vnc for noVNC observer sessions without requiring authentication, all
OpenClaw versions before 2026.2.26 allow authenticated attackers to write arbitrary files outside the workspace director
OpenClaw versions prior to 2026.2.22 contain a shell environment variable injection vulnerability in the system.run func
OpenClaw versions prior to 2026.2.22 contain a resource exhaustion vulnerability where the application fails to consiste
OpenClaw versions prior to 2026.3.1 contain a sandbox escape vulnerability that allows authenticated attackers with low
OpenClaw versions 2026.1.30 and below fail to validate Telegram webhook secret tokens when `channels.telegram.webhookSec
Same weakness CWE-294 – Authentication Bypass by Capture-replay
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-14563
GHSA-ffxm-98hg-x985