{"answers":{"affected":"6 open source packages ship an affected version, including n8n. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-42235 in the wild and no public exploit code.","fix":"Upgrade n8n to a fixed version for your release line: 1.123.32, 2.17.4 or 2.18.1.","what":"CVE-2026-42235 is a high-severity cross-site scripting vulnerability in N8n N8n, published on 4 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-42235 and fix it if it is affected.\n\nWhat it is: CVE-2026-42235 is a high-severity cross-site scripting vulnerability in N8n N8n, published on 4 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-42235 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- n8n (npm): affected all versions; fixed in 1.123.32\n- n8n (npm): affected all versions; fixed in 1.123.32\n- n8n (npm): affected from 2.17.0; fixed in 2.17.4\n- n8n (npm): affected from 2.17.0; fixed in 2.17.4\n- n8n (npm): affected from 2.18.0; fixed in 2.18.1\n- n8n (npm): affected from 2.18.0; fixed in 2.18.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42235/ (Markdown: https://insights.sbomify.com/CVE-2026-42235/index.md)","id":"CVE-2026-42235","markdown":"https://insights.sbomify.com/CVE-2026-42235/index.md","name":"CVE-2026-42235","record":{"aliases":["GHSA-537j-gqpc-p7fq"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"n8n workflow automation","requires_auth":"none","summary":"An unauthenticated attacker can inject JavaScript via a malicious MCP OAuth client name, leading to session hijacking and privilege escalation in n8n.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"n8n","vendor":"n8n"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","version":"4.0"},"cwes":[{"id":"CWE-87","name":"Improper Neutralization of Alternate XSS Syntax"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n browser session, enabling credential and session token theft, workflow manipulation, or privilege escalation. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"n8n: XSS via MCP OAuth client","id":"CVE-2026-42235","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"n8n:n8n","products":["n8n:n8n"],"type":"xss","year":"2026"},"n_packages":6,"n_references":1,"next":{"headline":"n8n: Unauthenticated Denial of Service via MCP Client Registration","id":"CVE-2026-42236"},"packages":[{"ecosystem":"npm","fixed":["1.123.32"],"introduced":["0"],"last_affected":[],"package":"n8n","purl":null,"source":"GHSA-537j-gqpc-p7fq"},{"ecosystem":"npm","fixed":["1.123.32"],"introduced":["0"],"last_affected":[],"package":"n8n","purl":"pkg:npm/n8n","source":"GHSA-537j-gqpc-p7fq"},{"ecosystem":"npm","fixed":["2.17.4"],"introduced":["2.17.0"],"last_affected":[],"package":"n8n","purl":null,"source":"GHSA-537j-gqpc-p7fq"},{"ecosystem":"npm","fixed":["2.17.4"],"introduced":["2.17.0"],"last_affected":[],"package":"n8n","purl":"pkg:npm/n8n","source":"GHSA-537j-gqpc-p7fq"},{"ecosystem":"npm","fixed":["2.18.1"],"introduced":["2.18.0"],"last_affected":[],"package":"n8n","purl":null,"source":"GHSA-537j-gqpc-p7fq"},{"ecosystem":"npm","fixed":["2.18.1"],"introduced":["2.18.0"],"last_affected":[],"package":"n8n","purl":"pkg:npm/n8n","source":"GHSA-537j-gqpc-p7fq"}],"prev":{"headline":"n8n: Python Task Runner Sandbox Escape","id":"CVE-2026-42234"},"products":["n8n"],"published":"2026-05-04","related":[{"cvss_score":10,"headline":"n8n Improper Control of Dynamically-Managed Code Resources","id":"CVE-2025-68613","kev_date_added":"2026-03-11","published":"2025-12-19"},{"cvss_score":10,"headline":"n8n is vulnerable to Remote Code Execution via Arbitrary File Write","id":"CVE-2026-21877","kev_date_added":null,"published":"2026-01-08"},{"cvss_score":10,"headline":"n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling","id":"CVE-2026-21858","kev_date_added":null,"published":"2026-01-07"},{"cvss_score":9.9,"headline":"n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution","id":"CVE-2026-1470","kev_date_added":null,"published":"2026-01-27"},{"cvss_score":9.9,"headline":"n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node","id":"CVE-2025-68668","kev_date_added":null,"published":"2025-12-26"},{"cvss_score":9.5,"headline":"n8n has Unauthenticated Expression Evaluation via Form Node","id":"CVE-2026-27493","kev_date_added":null,"published":"2026-02-25"},{"cvss_score":9.4,"headline":"n8n: HTTP Request Node Pagination Prototype Pollution to RCE","id":"CVE-2026-44789","kev_date_added":null,"published":"2026-06-23"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-05","vendors":["n8n-io"]},"summary":"An unauthenticated attacker can inject JavaScript via a malicious MCP OAuth client name, leading to session hijacking and privilege escalation in n8n.","url":"https://insights.sbomify.com/CVE-2026-42235/"}