Server-side Request Forgery (SSRF) Affecting a11y-mcp package, versions <1.0.5
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-A11YMCP-15907871
- published5 Apr 2026
- disclosed2 Apr 2026
- creditUnknown
Introduced: 2 Apr 2026
NewCVE-2026-5323 (opens in a new tab)How to fix?
Upgrade a11y-mcp to version 1.0.5 or higher.
Overview
a11y-mcp is a MCP server for performing accessibility audits on webpages
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the A11yServer function in index.js. An attacker can cause the server to initiate unintended requests to arbitrary resources by supplying crafted input from a local position.
Note: This is only exploitable if the attacker has local access to the system or can act through an authorized local process.