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CVE-2026-53837— OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

Quick assessment

Affected
OpenClaw OpenClaw
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenClaw是OpenClaw团队开源的一个智能人工助理。 OpenClaw 2026.5.6之前版本存在异常处理不当漏洞，该漏洞源于Mattermost事件处理程序中验证通道类型元数据时存在访问控制不当，攻击者可以通过发送缺少通道类型信息的特制Mattermost事件绕过预期的DM策略决策来处理受限内容。

CVSS 3.7 · Low EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenClaw OpenClaw < 2026.5.6 affected
2026.5.6 unaffected
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I. Basic Information for CVE-2026-53837

Vulnerability Information
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Vulnerability Title
OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers
Source: CVE Program / CVE List V5
Vulnerability Description
OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未能安全地进行程序失效(Failing Open)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenClaw 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenClaw是OpenClaw团队开源的一个智能人工助理。 OpenClaw 2026.5.6之前版本存在异常处理不当漏洞，该漏洞源于Mattermost事件处理程序中验证通道类型元数据时存在访问控制不当，攻击者可以通过发送缺少通道类型信息的特制Mattermost事件绕过预期的DM策略决策来处理受限内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenClaw OpenClaw 0 ~ 2026.5.6 -

II. Public POCs for CVE-2026-53837

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III. Intelligence Information for CVE-2026-53837

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Vendor Advisories for CVE-2026-53837 (2)

Same Patch Batch · OpenClaw · 2026-06-12 · 20 CVEs total

CVE-2026-53838 9.8 CRITICAL OpenClaw < 2026.5.27 - Node Pairing State Mutation via Reconnection
CVE-2026-53836 8.8 HIGH OpenClaw < 2026.5.12 - Allowlist Bypass via PowerShell Encoded-Command Aliases
CVE-2026-53822 8.8 HIGH OpenClaw < 2026.5.18 - Command Argument Modification via Shell Wrapper Between Approval an
CVE-2026-53821 8.8 HIGH OpenClaw < 2026.5.18 - Scope Elevation in trusted-proxy Control UI WebSocket
CVE-2026-53828 8.8 HIGH OpenClaw < 2026.5.6 - Native Command Authorization Bypass via Owner-Command Enforcement
CVE-2026-53831 8.3 HIGH OpenClaw < 2026.5.18 - Arbitrary File Read via Shell Expansion in system.run Safe-bin Allo
CVE-2026-53823 8.1 HIGH OpenClaw < 2026.5.3 - Privilege Escalation via Mutable Slack Display Names in allowFrom
CVE-2026-53829 8.0 HIGH OpenClaw < 2026.5.18 - Command Truncation in Exec Approval Display
CVE-2026-53832 7.7 HIGH OpenClaw < 2026.5.18 - Identity Header Forgery via Trusted-Proxy Configuration
CVE-2026-53833 7.7 HIGH QQBot for OpenClaw < 2026.4.29 - Authorization Bypass via QQBot Streaming Command
CVE-2026-53834 7.5 HIGH OpenClaw < 2026.4.27 - Authorization Bypass in QQBot Pre-dispatch Slash Commands
CVE-2026-53820 6.6 MEDIUM OpenClaw < 2026.5.12 - Exec Denylist Bypass in Bundle MCP Loopback Session Spawn
CVE-2026-53830 6.5 MEDIUM OpenClaw < 2026.4.22 - Webhook Secret Revocation Bypass via secrets.reload
CVE-2026-53839 6.5 MEDIUM OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation
CVE-2026-53827 6.5 MEDIUM OpenClaw < 2026.5.2 - Credential Exposure via Model-Supplied Loopback URLs in message.acti
CVE-2026-53825 6.5 MEDIUM OpenClaw < 2026.4.7 - Arbitrary Local File Read via memory-wiki Ingest with operator.write
CVE-2026-53824 6.5 MEDIUM Mattermost plugin for OpenClaw < 2026.4.24 - Slash Token Revocation Lag via Monitor Refres
CVE-2026-53826 4.3 MEDIUM OpenClaw < 2026.4.26 - Information Disclosure via Sandboxed Session Spawn
CVE-2026-53835 4.3 MEDIUM OpenClaw < 2026.5.6 - Config-Write Enforcement Bypass in Feishu Dynamic-Agent Bindings

IV. Related Vulnerabilities

Same product: OpenClaw
Same vendor: OpenClaw
Same weakness: CWE-636

V. Comments for CVE-2026-53837

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