{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-27203", "tracking": { "current_release_date": "2026-03-23T03:34:17.011983Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-27203", "initial_release_date": "2026-02-19T20:39:56.308038Z", "revision_history": [ { "date": "2026-02-19T20:39:56.308038Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-02-19T20:39:59.489725Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-21T00:25:15.354216Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-02-21T00:25:22.957380Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-21T00:38:44.083286Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-02-21T00:38:45.719113Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-02-21T14:14:42.877363Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-23T00:25:26.088623Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-02-23T00:25:27.609655Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-02-23T22:39:48.205717Z", "number": "10", "summary": "References created (1)." }, { "date": "2026-02-24T00:21:13.856570Z", "number": "11", "summary": "References created (1)." }, { "date": "2026-02-24T05:17:32.235455Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (20).| References created (4).| CWES updated (1)." }, { "date": "2026-02-25T21:38:45.577802Z", "number": "13", "summary": "Unknown change." }, { "date": "2026-02-26T05:28:59.615534Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:42:02.236967Z", "number": "15", "summary": "Source connected.| CVE status created. (valid)| EPSS created." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=1.7.2", "product": { "name": "vers:unknown/<=1.7.2", "product_id": "CSAFPID-5656460" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<=1.7.2", "product": { "name": "vers:unknown/>=0|<=1.7.2", "product_id": "CSAFPID-5664734" } } ], "category": "product_name", "name": "ebay-mcp" } ], "category": "vendor", "name": "YosefHayim" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.7.2", "product": { "name": "vers:unknown/1.7.2", "product_id": "CSAFPID-5686357" } }, { "category": "product_version_range", "name": "vers:unknown/v1.0.0", "product": { "name": "vers:unknown/v1.0.0", "product_id": "CSAFPID-5686358" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.0", "product": { "name": "vers:unknown/v1.1.0", "product_id": "CSAFPID-5686359" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.1", "product": { "name": "vers:unknown/v1.1.1", "product_id": "CSAFPID-5686360" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.2", "product": { "name": "vers:unknown/v1.1.2", "product_id": "CSAFPID-5686361" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.3", "product": { "name": "vers:unknown/v1.1.3", "product_id": "CSAFPID-5686362" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.4", "product": { "name": "vers:unknown/v1.1.4", "product_id": "CSAFPID-5686363" } }, { "category": "product_version_range", "name": "vers:unknown/v1.1.8", "product": { "name": "vers:unknown/v1.1.8", "product_id": "CSAFPID-5686364" } }, { "category": "product_version_range", "name": "vers:unknown/v1.2.0", "product": { "name": "vers:unknown/v1.2.0", "product_id": "CSAFPID-5686365" } }, { "category": "product_version_range", "name": "vers:unknown/v1.3.0", "product": { "name": "vers:unknown/v1.3.0", "product_id": "CSAFPID-5686366" } }, { "category": "product_version_range", "name": "vers:unknown/v1.4.0", "product": { "name": "vers:unknown/v1.4.0", "product_id": "CSAFPID-5686367" } }, { "category": "product_version_range", "name": "vers:unknown/v1.4.1", "product": { "name": "vers:unknown/v1.4.1", "product_id": "CSAFPID-5686368" } }, { "category": "product_version_range", "name": "vers:unknown/v1.4.6", "product": { "name": "vers:unknown/v1.4.6", "product_id": "CSAFPID-5686369" } }, { "category": "product_version_range", "name": "vers:unknown/v1.5.0", "product": { "name": "vers:unknown/v1.5.0", "product_id": "CSAFPID-5686370" } }, { "category": "product_version_range", "name": "vers:unknown/v1.5.1", "product": { "name": "vers:unknown/v1.5.1", "product_id": "CSAFPID-5686371" } }, { "category": "product_version_range", "name": "vers:unknown/v1.6.0", "product": { "name": "vers:unknown/v1.6.0", "product_id": "CSAFPID-5686372" } }, { "category": "product_version_range", "name": "vers:unknown/v1.6.3", "product": { "name": "vers:unknown/v1.6.3", "product_id": "CSAFPID-5686373" } }, { "category": "product_version_range", "name": "vers:unknown/v1.6.4", "product": { "name": "vers:unknown/v1.6.4", "product_id": "CSAFPID-5686374" } }, { "category": "product_version_range", "name": "vers:unknown/v1.7.0", "product": { "name": "vers:unknown/v1.7.0", "product_id": "CSAFPID-5686375" } }, { "category": "product_version_range", "name": "vers:unknown/v1.7.1", "product": { "name": "vers:unknown/v1.7.1", "product_id": "CSAFPID-5686376" } } ], "category": "product_name", "name": "ebay-mcp" } ], "category": "vendor", "name": "yosefhayim" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27203", "cwe": { "id": "CWE-15", "name": "External Control of System or Configuration Setting" }, "notes": [ { "category": "description", "text": "The `ebay_set_user_tokens` tool allows updating the `.env` file with new tokens. The `updateEnvFile` function in `src/auth/oauth.ts` blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file.\n\n### Impact\nAn attacker can inject arbitrary environment variables into the `.env` file. This could lead to:\n- **Configuration Overwrites**: Attackers can overwrite critical settings like `EBAY_REDIRECT_URI` to hijack OAuth flows.\n- **Denial of Service**: Injecting invalid configuration can prevent the server from starting.\n- **Potential RCE**: In some environments, controlling environment variables (like `NODE_OPTIONS`) can lead to Remote Code Execution.\n\nFound with [MCPwner](https://github.com/Pigyon/MCPwner) 🕶", "title": "github - https://github.com/advisories/GHSA-97rm-xj73-33jh" }, { "category": "description", "text": "eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions are vulnerable to Environment Variable Injection through the updateEnvFile function. The ebay_set_user_tokens tool allows updating the .env file with new tokens. The updateEnvFile function in src/auth/oauth.ts blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file. An attacker can inject arbitrary environment variables into the .env file. This could lead to configuration overwrites, Denial of Service, and potential RCE. There was no fix for this issue at the time of publication.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27203" }, { "category": "description", "text": "eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions are vulnerable to Environment Variable Injection through the updateEnvFile function. The ebay_set_user_tokens tool allows updating the .env file with new tokens. The updateEnvFile function in src/auth/oauth.ts blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file. An attacker can inject arbitrary environment variables into the .env file. This could lead to configuration overwrites, Denial of Service, and potential RCE. There was no fix for this issue at the time of publication.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27203" }, { "category": "description", "text": "The `ebay_set_user_tokens` tool allows updating the `.env` file with new tokens. The `updateEnvFile` function in `src/auth/oauth.ts` blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file.\n\n### Impact\nAn attacker can inject arbitrary environment variables into the `.env` file. This could lead to:\n- **Configuration Overwrites**: Attackers can overwrite critical settings like `EBAY_REDIRECT_URI` to hijack OAuth flows.\n- **Denial of Service**: Injecting invalid configuration can prevent the server from starting.\n- **Potential RCE**: In some environments, controlling environment variables (like `NODE_OPTIONS`) can lead to Remote Code Execution.\n\nFound with [MCPwner](https://github.com/Pigyon/MCPwner) 🕶", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-97rm-xj73-33jh.json?alt=media" }, { "category": "description", "text": "eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions are vulnerable to Environment Variable Injection through the updateEnvFile function. The ebay_set_user_tokens tool allows updating the .env file with new tokens. The updateEnvFile function in src/auth/oauth.ts blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables into the configuration file. An attacker can inject arbitrary environment variables into the .env file. This could lead to configuration overwrites, Denial of Service, and potential RCE. There was no fix for this issue at the time of publication.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27203.json?alt=media" }, { "category": "other", "text": "0.00047", "title": "EPSS" }, { "category": "other", "text": "4.4", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Cveprojectv5", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is cwe data available from source Nvd", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5656460", "CSAFPID-5664734", "CSAFPID-5686357", "CSAFPID-5686358", "CSAFPID-5686359", "CSAFPID-5686360", "CSAFPID-5686361", "CSAFPID-5686362", "CSAFPID-5686363", "CSAFPID-5686364", "CSAFPID-5686365", "CSAFPID-5686366", "CSAFPID-5686367", "CSAFPID-5686368", "CSAFPID-5686369", "CSAFPID-5686370", "CSAFPID-5686371", "CSAFPID-5686372", "CSAFPID-5686373", "CSAFPID-5686374", "CSAFPID-5686375", "CSAFPID-5686376" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-97rm-xj73-33jh" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-97rm-xj73-33jh" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27203" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27203" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27203" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27203.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27203" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-97rm-xj73-33jh.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27203.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b3c4a9a" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-97rm-xj73-33jh" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27203" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27203.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5656460", "CSAFPID-5664734", "CSAFPID-5686357", "CSAFPID-5686358", "CSAFPID-5686359", "CSAFPID-5686360", "CSAFPID-5686361", "CSAFPID-5686362", "CSAFPID-5686363", "CSAFPID-5686364", "CSAFPID-5686365", "CSAFPID-5686366", "CSAFPID-5686367", "CSAFPID-5686368", "CSAFPID-5686369", "CSAFPID-5686370", "CSAFPID-5686371", "CSAFPID-5686372", "CSAFPID-5686373", "CSAFPID-5686374", "CSAFPID-5686375", "CSAFPID-5686376" ] } ], "title": "CVE-2026-27203" } ] }