Information Disclosure Vulnerability in OpenClaw by OpenClaw
CVE-2026-53840

6MEDIUM

Key Information:

Vendor

Openclaw

Status
Openclaw
Vendor
CVE Published:
16 June 2026

What is CVE-2026-53840?

OpenClaw versions prior to 2026.5.12 are vulnerable to an information disclosure issue affecting streamable HTTP MCP servers. This vulnerability allows attackers with control over an MCP endpoint to execute cross-origin redirects, potentially exfiltrating sensitive operator-configured custom headers, such as API keys and tenant-routing credentials, to unauthorized origins. Properly securing these headers is crucial to prevent sensitive data leakage and mitigate risks associated with unauthorized access.

Affected Version(s)

OpenClaw 0 < 2026.5.12

OpenClaw 2026.5.12

References

https://github.com/openclaw/openclaw/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/openclaw-custom-head...
third-party-advisory

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Edward-x (@YLChen-007)
.