| Title | jae-jae fetcher-mcp 0.3.9 non-blind SSRF |
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| Description | fetcher-mcp has a non-blind SSRF vulnerability in its fetch_url and fetch_urls tools. The only URL validation is validateUrlProtocol(), which checks that the scheme is http: or https:. It does not reject loopback, private, link-local, reserved, or cloud metadata addresses before page.goto(url). The validated URL is then passed to Playwright navigation through page.goto(url), and the fetched page content can be returned to the MCP caller. |
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| Source | ⚠️ https://github.com/jae-jae/fetcher-mcp/issues/37 |
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| User | xiaobu (UID 99226) |
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| Submission | 07/01/2026 09:27 (2 months ago) |
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| Moderation | 08/17/2026 11:51 (2 months later) |
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| Status | Accepted |
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| VulDB entry | 391221 [jae-jae fetcher-mcp up to 0.3.9 URL Validation security-credentials fetch_url/fetch_urls server-side request forgery] |
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| Points | 20 |
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