High severity7.1NVD Advisory· Published Jun 16, 2026· Updated Jun 16, 2026

CVE-2026-53840

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
openclawnpm	< 2026.5.12	2026.5.12

Affected products

OpenClaw/Openclawinferred2 versions
<2026.5.12+ 1 more
- (no CPE)range: <2026.5.12
- (no CPE)range: < 2026.5.12
ghsa-coords
pkg:npm/openclaw
Range: < 2026.5.12

Patches

Vulnerability mechanics

References

News mentions

No linked articles in our index yet.

Severity

HighCVSS v3.1

7.1/ 10

CVSS v46.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: Low
Availability: None

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected

Source repo: github.com/openclaw/openclaw

EPSS

Probability of exploitation in the next 30 days.

0.22%

VYPR risk score

Composite of severity, exploitation, and reach.

0.39medium

cvss	0.461
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000

Weaknesses

CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CWE-522
Insufficiently Protected Credentials

CVE ID

CVE-2026-53840

Credits

Y
YLChen-007
reporter · ghsa