OpenClaw Canvas Path Traversal Information Disclosure Vulnerability

An attacker exploiting CVE-2026-3689 can leverage the path traversal flaw to read files outside of the intended directory. Because authentication is required, the attacker must first authenticate to the system. Successful exploitation allows the attacker to disclose sensitive information accessible to the service account under which OpenClaw is running. This could include configuration files, database credentials, or other sensitive data. The blast radius is limited to the data accessible by the service account, but the potential for data exposure remains significant. While the vulnerability requires authentication, the ease of path traversal exploitation could make it attractive to attackers with compromised credentials.

Organizations deploying OpenClaw, particularly those with publicly accessible canvas gateway endpoints, are at risk. Shared hosting environments where multiple users share the same OpenClaw instance are also particularly vulnerable, as an attacker compromising one user's account could potentially exploit this vulnerability to access data belonging to other users.

• linux / server:

journalctl -u openclaw -g 'canvas gateway' | grep -i "path traversal"

• linux / server:

lsof -p $(pidof openclaw) | grep /path/to/sensitive/file

• generic web:

curl -I http://your-openclaw-server/canvas/path/../sensitive/file.txt

1. 2026-04-11Disclosure

   disclosure

1. Reserviert2026-03-07
2. Veröffentlicht2026-04-11
3. Geändert2026-04-13
4. EPSS aktualisiert2026-04-18

The primary mitigation for CVE-2026-3689 is to upgrade to a patched version of OpenClaw as soon as it becomes available. Until a patch is applied, consider implementing stricter access controls to limit the service account's privileges and reduce the potential impact of a successful attack. Implement input validation on the canvas gateway endpoint to prevent malicious path manipulation. Web application firewalls (WAFs) configured with rules to detect and block path traversal attempts can provide an additional layer of defense. Monitor OpenClaw logs for suspicious activity, such as unusual file access patterns, to detect potential exploitation attempts.