---
id: GHSA-x7cf-6gp3-q5f8
title: >-
  Duplicate Advisory: MCP Streamable HTTP redirects could forward configured
  custom headers to another origin
summary: >-
  Duplicate Advisory: MCP Streamable HTTP redirects could forward configured
  custom headers to another origin
severity: medium
cvss: 7.1
cwe:
  - CWE-522
vendor: openclaw
product: openclaw
ecosystem: pip
affected:
  - openclaw < 2026.5.12
published: '2026-06-16'
updated: '2026-06-17'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-x7cf-6gp3-q5f8'
references:
  - url: >-
      https://github.com/openclaw/openclaw/security/advisories/GHSA-rjxq-qqhf-8hwh
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53840'
  - url: >-
      https://www.vulncheck.com/advisories/openclaw-custom-header-leakage-via-mcp-streamable-http-cross-origin-redirects
  - url: 'https://github.com/advisories/GHSA-x7cf-6gp3-q5f8'
tags:
  - ghsa
  - pip
ingestedAt: '2026-06-29T14:31:47.664Z'
---

## Overview

## Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-rjxq-qqhf-8hwh. This link is maintained to preserve external references.

## Original 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.

## Affected packages

- `openclaw < 2026.5.12`

## Remediation

Refer to the advisory for the patched release.