{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-22540 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-22540 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-22540 is a medium-severity cross-site scripting vulnerability in Google LLC Dart SDK, published on 22 Apr 2021. 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-2021-22540 and fix it if it is affected.\n\nWhat it is: CVE-2021-22540 is a medium-severity cross-site scripting vulnerability in Google LLC Dart SDK, published on 22 Apr 2021. 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-2021-22540 in the wild and no public exploit code.\n\nAffected product: Google LLC Dart SDK. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2021-22540/ (Markdown: https://insights.sbomify.com/CVE-2021-22540/index.md)","id":"CVE-2021-22540","markdown":"https://insights.sbomify.com/CVE-2021-22540/index.md","name":"CVE-2021-22540","record":{"aliases":["GHSA-36mh-f84c-9fqq","GHSA-3rfv-4jvg-9522"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Dart SDK","requires_auth":"none","summary":"An attacker can execute arbitrary scripts via DOM clobbering in Dart SDK applications due to improper sanitization of template tags.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Google","cpe":[{"product":"dart_software_development_kit","vendor":"dart"}],"cvss":{"score":6.1,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"XSS in Dart SDK","id":"CVE-2021-22540","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"Improper memory handling in Linux KVM","id":"CVE-2021-22543"},"packages":[],"prev":{"headline":"Code execution in VSCode-bazel via malicious Bazel config files","id":"CVE-2021-22539"},"products":["Dart SDK"],"published":"2021-04-22","related":[{"cvss_score":9.8,"headline":"Incorrect parsing of the backslash characters in Dart library","id":"CVE-2022-3095","kev_date_added":null,"published":"2022-10-27"},{"cvss_score":8.8,"headline":"Dart - Publishing to third-party package repositories may expose pub.dev credentials","id":"CVE-2021-22568","kev_date_added":null,"published":"2021-12-09"},{"cvss_score":6.6,"headline":"Dart SDK and Flutter SDK have Zip slip in Dart Pub package extraction","id":"CVE-2026-27704","kev_date_added":null,"published":"2026-02-25"},{"cvss_score":6.5,"headline":"Auth bypass in Dark SDK","id":"CVE-2022-0451","kev_date_added":null,"published":"2022-02-18"},{"cvss_score":5.4,"headline":"XSS in Dart","id":"CVE-2020-8923","kev_date_added":null,"published":"2020-03-26"},{"cvss_score":4.6,"headline":"Bidirectional Override in Dart SDK","id":"CVE-2021-22567","kev_date_added":null,"published":"2022-01-05"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Google LLC"]},"summary":"An attacker can execute arbitrary scripts via DOM clobbering in Dart SDK applications due to improper sanitization of template tags.","url":"https://insights.sbomify.com/CVE-2021-22540/"}