CVE-2026-5323 priyankark a11y-mcp index.js A11yServer server-side request forgery
A local attacker can exploit server-side request forgery in the a11y-mcp library to access internal resources or bypass security controls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-5323?
CVE-2026-5323 is a medium-severity server-side request forgery vulnerability in priyankark a11y-mcp, published on 2 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in priyankark a11y-mcp up to 1.0.5. This vulnerability affects the function A11yServer of the file src/index.js. The manipulation results in server-side request forgery. The attack must be initiated from a local position. The exploit has been made public and could be used. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. Upgrading to version 1.0.6 is able to resolve this issue. The patch is identified as e3e11c9e8482bd06b82fd9fced67be4856f0dffc. It is recommended to upgrade the affected component. The vendor acknowledged the issue but provides additional context for the CVSS rating: "a11y-mcp is a local stdio MCP server - it has no HTTP endpoint and is not network-accessible. The caller is always the local user or an LLM acting on their behalf with user approval."
Weakness: CWE-918
Which versions are affected by CVE-2026-5323?
2 open source packages ship an affected version, including a11y-mcp.
| Package | Affected | Fixed in |
|---|---|---|
a11y-mcp npm | All versions | 1.0.5 |
a11y-mcp npm | All versions | 1.0.5 |
How do I fix CVE-2026-5323?
Upgrade a11y-mcp to 1.0.5 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-5323 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5323 exists.
Sources
Also known as GHSA-prmx-7v35-7q82.