{"answers":{"affected":"2 open source packages ship an affected version, including mermaid. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-35513 in the wild and no public exploit code.","fix":"Upgrade mermaid to 8.11.0 or later.","what":"CVE-2021-35513 is a medium-severity cross-site scripting vulnerability in n/a, published on 27 Jun 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-2021-35513 and fix it if it is affected.\n\nWhat it is: CVE-2021-35513 is a medium-severity cross-site scripting vulnerability in n/a, published on 27 Jun 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-2021-35513 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mermaid (npm): affected all versions; fixed in 8.11.0\n- mermaid (npm): affected all versions; fixed in 8.11.0\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-2021-35513/ (Markdown: https://insights.sbomify.com/CVE-2021-35513/index.md)","id":"CVE-2021-35513","markdown":"https://insights.sbomify.com/CVE-2021-35513/index.md","name":"CVE-2021-35513","record":{"aliases":["DEBIAN-CVE-2021-35513","GHSA-4f6x-49g2-99fm","UBUNTU-CVE-2021-35513"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"JavaScript diagramming library","requires_auth":"none","summary":"Attackers can execute arbitrary scripts via XSS in Mermaid when the antiscript feature is enabled, affecting applications using this library.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"mermaid","vendor":"mermaid_project"}],"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":"Mermaid before 8.11.0 allows XSS when the antiscript feature is used.","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":"Cross-site Scripting in Mermaid","id":"CVE-2021-35513","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Code injection in Narou","id":"CVE-2021-35514"},"packages":[{"ecosystem":"npm","fixed":["8.11.0"],"introduced":["0"],"last_affected":[],"package":"mermaid","purl":null,"source":"GHSA-4f6x-49g2-99fm"},{"ecosystem":"npm","fixed":["8.11.0"],"introduced":["0"],"last_affected":[],"package":"mermaid","purl":"pkg:npm/mermaid","source":"GHSA-4f6x-49g2-99fm"}],"prev":{"headline":"Server-side request forgery in n/a","id":"CVE-2021-35512"},"products":["n/a"],"published":"2021-06-27","related":[{"cvss_score":7.2,"headline":"Incorrect sanitisation function leads to `XSS`","id":"CVE-2021-43861","kev_date_added":null,"published":"2021-12-30"},{"cvss_score":5.3,"headline":"Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS","id":"CVE-2026-41150","kev_date_added":null,"published":"2026-05-29"},{"cvss_score":5.3,"headline":"Mermaid: Improper sanitization of configuration leads to CSS injection","id":"CVE-2026-41159","kev_date_added":null,"published":"2026-05-29"},{"cvss_score":5.1,"headline":"Mermaid does not properly sanitize architecture diagram iconText leading to XSS","id":"CVE-2025-54880","kev_date_added":null,"published":"2025-08-19"},{"cvss_score":4.1,"headline":"Arbitrary `CSS` injection into the generated graph affecting the container HTML in mermaid.js","id":"CVE-2022-31108","kev_date_added":null,"published":"2022-06-28"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"Attackers can execute arbitrary scripts via XSS in Mermaid when the antiscript feature is enabled, affecting applications using this library.","url":"https://insights.sbomify.com/CVE-2021-35513/"}