priyankark a11y-mcp up to 1.0.5 src/index.js A11yServer server-side request forgery

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.56

Summaryinfo

A vulnerability was found in priyankark a11y-mcp up to 1.0.5. It has been rated as critical. This issue affects the function A11yServer of the file src/index.js. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-5323. The attack needs to be launched locally. Furthermore, an exploit is available. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. Upgrading the affected component is advised. 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."

Detailsinfo

A vulnerability classified as critical was found in priyankark a11y-mcp up to 1.0.5. Affected by this vulnerability is the function A11yServer of the file src/index.js. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. 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. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-5323. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. 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."

Upgrading to version 1.0.6 eliminates this vulnerability. Applying the patch e3e11c9e8482bd06b82fd9fced67be4856f0dffc is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18130). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

Vendor Base Score (priyankark): 3.3
Vendor Vector (priyankark): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: a11y-mcp 1.0.6
Patch: e3e11c9e8482bd06b82fd9fced67be4856f0dffc

Timelineinfo

04/01/2026 Advisory disclosed
04/01/2026 +0 days VulDB entry created
04/02/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-5323 (🔒)
GCVE (CVE): GCVE-0-2026-5323
GCVE (VulDB): GCVE-100-354655
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/01/2026 15:17
Updated: 04/02/2026 10:52
Changes: 04/01/2026 15:17 (59), 04/01/2026 15:18 (11), 04/02/2026 10:52 (1)
Complete: 🔍
Submitter: BigW
Cache ID: 216:1E1:103

Submitinfo

Accepted

  • Submit #780752: priyankark a11y-mcp 1.0.4 Server-Side Request Forgery (by BigW)

Be aware that VulDB is the high quality source for vulnerability data.

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