CVE-2026-53840
HIGHOpenClaw < 2026.5.12 - Custom Header Leakage via MCP Streamable HTTP Cross-Origin Redirects
Title source: cnaDescription
OpenClaw before 2026.5.12 contains an information disclosure vulnerability in streamable-http MCP servers that forwards operator-configured custom headers during cross-origin redirects. Attackers controlling or compromising an MCP endpoint can redirect requests to exfiltrate sensitive headers like API keys or tenant-routing credentials to attacker-controlled origins.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-rjxq-qqhf-8hwh)
https://github.com/openclaw/openclaw/security/advisories/GHSA-rjxq-qqhf-8hwh
Third Party Advisory third-party-advisory
VulnCheck Advisory: OpenClaw < 2026.5.12 - Custom Header Leakage via MCP Streamable HTTP Cross-Origin Redirects
https://www.vulncheck.com/advisories/openclaw-custom-header-leakage-via-mcp-streamable-http-cross-origin-redirects
Scores
CVSS v3
7.1
EPSS
0.0022
EPSS Percentile
12.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-522
Status
published
Products (5)
npm/openclaw
0 - 2026.5.12npm
openclaw/openclaw
2026.5.12 beta1 (8 CPE variants)
OpenClaw/OpenClaw
< 2026.5.12
openclaw/openclaw
< 2026.5.12
OpenClaw/OpenClaw
2026.5.12
Published
Jun 16, 2026
Tracked Since
Jun 17, 2026