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How CVE-2026-53823 Works
OpenClaw before version 2026.5.3 contains a privilege escalation vulnerability in the `allowFrom` feature. The `allowFrom` mechanism is designed to restrict which Slack users can access specific agents or tools by evaluating policy entries against incoming requests.
The root cause of this vulnerability is that the `allowFrom` feature binds to mutable Slack display names rather than immutable Slack user IDs. Slack allows users to change their display name at any time. An attacker with a Slack account can change their display name metadata to match a policy entry that was originally intended for a different, trusted identity.
Because OpenClaw resolves these human-readable identifiers during service initialization or at runtime, a malicious actor can impersonate a trusted user simply by renaming themselves. When the attacker’s request is processed, OpenClaw compares the provided display name against the `allowFrom` allowlist. If the names match, the system grants the attacker the same agent access privileges that were configured for the legitimate user.
This effectively allows a low-privileged Slack user to escalate their permissions within the OpenClaw Gateway environment. The vulnerability does not compromise the underlying Slack platform but abuses the trust relationship between OpenClaw and the Slack display name metadata. The practical impact depends on the operator’s configuration and whether lower-trust input can reach the vulnerable path. The issue is scoped to the named feature and configuration and does not change OpenClaw’s trusted-operator model.
DailyCVE Form
Platform: ……. OpenClaw
Version: …….. < 2026.5.3
Vulnerability :…… Privilege Escalation (CWE-290)
Severity: ……. High (CVSS 8.6)
date: ………. June 12, 2026
Prediction: …… July 2026
What Undercode Say: Analytics
Undercode’s analytics highlight the following key technical indicators for this vulnerability:
– Attack Vector: Network
– Attack Complexity: Low
– Privileges Required: Low
– User Interaction: None
– Confidentiality Impact: High
– Integrity Impact: High
Bash Command to Check OpenClaw Version:
openclaw --version
Code Snippet Showing the Vulnerable Pattern (Conceptual):
Vulnerable approach: binding allowFrom to mutable display names allowed_users = ["trusted_admin", "security_team"] sender_display_name = get_slack_display_name(event) if sender_display_name in allowed_users: grant_agent_access()
Code Snippet Showing the Fixed Approach (Conceptual):
Fixed approach: binding allowFrom to immutable Slack user IDs allowed_user_ids = ["U1234567", "U7654321"] sender_user_id = get_slack_user_id(event) if sender_user_id in allowed_user_ids: grant_agent_access()
Log Analysis Command to Detect Potential Exploitation:
grep -i "allowFrom" /var/log/openclaw/access.log | grep -E "display_name|user_id"
Exploit
Exploitation of CVE-2026-53823 is straightforward and requires minimal prerequisites:
1. Prerequisites:
- The attacker must have a valid Slack account within the same workspace.
- The OpenClaw Gateway must have the `allowFrom` feature enabled and configured to use display names.
- The target `allowFrom` policy must contain a display name entry that the attacker can impersonate.
2. Steps to Exploit:
- Identify a target display name that is present in an `allowFrom` allowlist (e.g.,
admin-user). - Using the Slack interface or API, change the attacker’s own display name to match the target name exactly.
- Send a request to the OpenClaw Gateway. The `allowFrom` check will compare the attacker’s new display name against the policy and grant access as if the attacker were the legitimate user.
3. Outcome:
- The attacker gains unauthorized agent access intended for the spoofed identity. This can lead to data exfiltration, unauthorized actions, or further privilege escalation within the connected systems.
Protection
Protection against CVE-2026-53823 involves both immediate mitigations and permanent fixes:
1. Immediate Mitigations:
- Upgrade: The first stable patched version is 2026.5.3. Upgrade to this version or later immediately.
- Use Stable Slack User IDs: In `allowFrom` allowlists, use immutable Slack user IDs (e.g.,
U1234567) instead of mutable display names. - Narrow Allowlists: Keep channel and tool allowlists as narrow as possible.
- Disable Affected Feature: If the feature is not needed, disable it.
- Avoid Sharing Gateways: Avoid sharing one Gateway between mutually untrusted users.
2. Long-Term Hardening:
- Audit Logs: Review agent access logs to identify any unauthorized access resulting from display name spoofing.
- Policy Review: Review and update all access control policies that rely on mutable identifiers.
- Principle of Least Privilege: Ensure that all agents and tools are configured with the minimum necessary permissions.
Impact
- Confidentiality: An attacker can gain access to agents and data intended for other Slack identities, leading to unauthorized data exposure (High impact).
- Integrity: The attacker can perform actions on behalf of the spoofed user, potentially modifying data or system configurations (High impact).
- Availability: No direct availability impact is noted; the vulnerability does not cause denial of service.
- Scope: The vulnerability is specific to OpenClaw instances that use the `allowFrom` feature with Slack display names. The practical impact depends on the operator’s configuration and whether lower-trust input can reach the vulnerable path.
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Sources:
Reported By: github.com
Extra Source Hub:
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