CVE-2026-5323 | priyankark a11y-mcp up to 1.0.5 src/index.js A11yServer server-side request forgery

VDB-354655 · CVE-2026-5323 · GCVE-100-354655 priyankark a11y-mcp up to 1.0.5 src/index.js A11yServer server-side request forgery HistoryDiffrelatejsonxmlCTI CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system. Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack. CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability. 4.1 $0-$5k 1.04+ 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. Productinfo Vendor priyankark Name a11y-mcp Version 1.0.0 1.0.1 1.0.2 1.0.3 1.0.4 1.0.5 License open-source Website Product: https://github.com/priyankark/a11y-mcp/ 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 AV AC Au C I A 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 💳 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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 04/01/2026 +0 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 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 04/01/2026 15:17 Changes: 04/01/2026 15:17 (59), 04/01/2026 15:18 (11) Complete: 🔍 Submitter: BigW Cache ID: 99:078:101 Submitinfo Accepted Submit #780752: priyankark a11y-mcp 1.0.4 Server-Side Request Forgery (by BigW) Discussion No comments yet. 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