{"answers":{"affected":"4 open source packages ship an affected version, including @file-viewer/doc and msdoc-viewer.","exploited":"There is no known exploitation of CVE-2026-91127 in the wild and no public exploit code.","fix":"Upgrade @file-viewer/doc to 2.3.1 or later.","what":"CVE-2026-91127 is a high-severity cross-site scripting vulnerability in @file-viewer doc, published on 18 Sep 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-2026-91127 and fix it if it is affected.\n\nWhat it is: CVE-2026-91127 is a high-severity cross-site scripting vulnerability in @file-viewer doc, published on 18 Sep 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-2026-91127 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @file-viewer/doc (npm): affected all versions; fixed in 2.3.1\n- @file-viewer/doc (npm): affected all versions; fixed in 2.3.1\n- msdoc-viewer (npm): affected all versions; fixed in 0.2.2\n- msdoc-viewer (npm): affected all versions; fixed in 0.2.2\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-2026-91127/ (Markdown: https://insights.sbomify.com/CVE-2026-91127/index.md)","id":"CVE-2026-91127","markdown":"https://insights.sbomify.com/CVE-2026-91127/index.md","name":"CVE-2026-91127","record":{"aliases":["GHSA-3753-m2x2-q623"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"File viewer library","requires_auth":"none","summary":"Attackers can execute arbitrary JavaScript in the embedding application's origin by tricking users into clicking malicious links in crafted DOC files.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-83","name":"Improper Neutralization of Script in Attributes in a Web Page"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"File Viewer is a browser-native viewer for Office, PDF, CAD, archive, and other files in private and internal web applications. Prior to @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2, the legacy DOC renderer emitted document-controlled hyperlink targets into generated HTML after character escaping but without restricting URL schemes. A crafted legacy DOC file could place javascript:, vbscript:, data:, or another unsafe scheme in a rendered link, and script could execute in the embedding application's origin when a user clicked the link. The fix blocks external document links by default, allows only HTTP(S), mail, telephone, safe relative URLs, and internal bookmarks when external links are explicitly enabled, and applies mount-boundary sanitization as defense in depth. This issue is fixed in @file-viewer/doc 2.3.1 and msdoc-viewer 0.2.2.","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":"File Viewer: DOM XSS via unsafe hyperlink schemes in the legacy DOC renderer","id":"CVE-2026-91127","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"Home Assistant: mDNS Server-Side Request Forgery","id":"CVE-2026-91129"},"packages":[{"ecosystem":"npm","fixed":["2.3.1"],"introduced":["0"],"last_affected":[],"package":"@file-viewer/doc","purl":null,"source":"GHSA-3753-m2x2-q623"},{"ecosystem":"npm","fixed":["2.3.1"],"introduced":["0"],"last_affected":[],"package":"@file-viewer/doc","purl":"pkg:npm/%40file-viewer/doc","source":"GHSA-3753-m2x2-q623"},{"ecosystem":"npm","fixed":["0.2.2"],"introduced":["0"],"last_affected":[],"package":"msdoc-viewer","purl":null,"source":"GHSA-3753-m2x2-q623"},{"ecosystem":"npm","fixed":["0.2.2"],"introduced":["0"],"last_affected":[],"package":"msdoc-viewer","purl":"pkg:npm/msdoc-viewer","source":"GHSA-3753-m2x2-q623"}],"prev":{"headline":"Discourse: Reject literal backslash path separators in iframe src traversal guard","id":"CVE-2026-91123"},"products":["doc","file-viewer","msdoc-viewer"],"published":"2026-09-18","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-22","vendors":["@file-viewer","flyfish-dev"]},"summary":"Attackers can execute arbitrary JavaScript in the embedding application's origin by tricking users into clicking malicious links in crafted DOC files.","url":"https://insights.sbomify.com/CVE-2026-91127/"}