CVE-2026-5323: a11y-mcp Server-Side Request Forgery (SSRF) Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-prmx-7v35-7q82
Share
CVSS 5.3
CWE-918
Published
Advisory Summary

CVE-2026-5323 is a LOW (CVSS 5.3) server-side request forgery (ssrf) vulnerability vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting a11y-mcp libraries in the npm ecosystem. The issue involves server-side request forgery (ssrf) vulnerability in a11yserver function. Remediation is available by upgrading affected packages to version 1.0.5.

CVE-2026-5323 at a Glance

CVE Identifier CVE-2026-5323
GHSA Identifier GHSA-prmx-7v35-7q82
Severity LOW
CVSS v3.1 Base Score 5.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product a11y-mcp
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-5323

To remediate this vulnerability, upgrade all affected a11y-mcp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

a11y-mcp fixed: 1.0.5 
npm install a11y-mcp@1.0.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls a11y-mcp

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-5323, inspect your project dependencies using npm:

npm ls a11y-mcp

Analyze the terminal output to locate any version of a11y-mcp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.5), your application is affected.

Note: The npm ls a11y-mcp command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In a11y-mcp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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."

CVE-2026-5323 Affected a11y-mcp Versions

1 component(s)
Fixed Versions:
1.0.5
Product / Package Ecosystem Affected Versions Fixed Version
a11y-mcp
npm/a11y-mcp
npm
< 1.0.5
1.0.5

References

NVD — CVE-2026-5323 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5323
a11y-mcp Source Repository REPOSITORY
https://github.com/wing3e/public_exp/issues/17
Security Fix Commit FIX COMMIT
https://github.com/priyankark/a11y-mcp/commit/e3e11c9e8482bd06b82fd9fced67be4856f0dffc
a11y-mcp Source Repository REPOSITORY
https://github.com/priyankark/a11y-mcp
vuldb.com/submit/780752 WEB
https://vuldb.com/submit/780752
vuldb.com/vuln/354655 WEB
https://vuldb.com/vuln/354655
vuldb.com/vuln/354655/cti WEB
https://vuldb.com/vuln/354655/cti

Frequently Asked Questions

What is CVE-2026-5323?
CVE-2026-5323 is a security vulnerability in a11y-mcp involving Server-Side Request Forgery (SSRF) vulnerability in A11yServer function under CWE-918: Server-Side Request Forgery (SSRF).
Which a11y-mcp versions are affected?
Affected versions include releases prior to 1.0.5 across affected packages: a11y-mcp.
What version fixes CVE-2026-5323?
Upgrading to 1.0.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is a11y-mcp affected?
Yes, a11y-mcp is affected in releases prior to 1.0.5. Upgrade your dependency to 1.0.5 or later.
What is the CVSS score of CVE-2026-5323?
CVE-2026-5323 has a CVSS v3.1 base score of 5.3 (LOW) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-5323?
CVE-2026-5323 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check npm dependencies for CVE-2026-5323?
Run the dependency tree command: 'npm ls a11y-mcp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-prmx-7v35-7q82",
  "modified" : "2026-04-04T05:35:52Z",
  "published" : "2026-04-02T09:30:24Z",
  "aliases" : [ "CVE-2026-5323" ],
  "summary" : "a11y-mcp: Server-Side Request Forgery (SSRF) vulnerability in A11yServer function",
  "details" : "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. \n\nUpgrading 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.\"",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "a11y-mcp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-5323"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wing3e/public_exp/issues/17"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/priyankark/a11y-mcp/commit/e3e11c9e8482bd06b82fd9fced67be4856f0dffc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/priyankark/a11y-mcp"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/780752"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/354655"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/354655/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-04T05:35:52Z",
    "nvd_published_at" : "2026-04-02T07:15:58Z"
  }
}