{"answers":{"affected":"2 open source packages ship an affected version, including craftcms/cms. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-27902 in the wild and no public exploit code.","fix":"Upgrade craftcms/cms to 3.6.0 or later.","what":"CVE-2021-27902 is a medium-severity cross-site scripting vulnerability in Craftcms Craft Cms, published on 30 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-2021-27902 and fix it if it is affected.\n\nWhat it is: CVE-2021-27902 is a medium-severity cross-site scripting vulnerability in Craftcms Craft Cms, published on 30 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-2021-27902 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- craftcms/cms (Packagist): affected all versions; fixed in 3.6.0\n- craftcms/cms (Packagist): affected all versions; fixed in 3.6.0\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-2021-27902/ (Markdown: https://insights.sbomify.com/CVE-2021-27902/index.md)","id":"CVE-2021-27902","markdown":"https://insights.sbomify.com/CVE-2021-27902/index.md","name":"CVE-2021-27902","record":{"aliases":["GHSA-3jxh-789f-p7m6"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Craft CMS","requires_auth":"none","summary":"An XSS vulnerability in Craft CMS front-end forms allows attackers to inject malicious scripts via user uploads.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"craft_cms","vendor":"craftcms"}],"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":"An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.","ecosystems":["Packagist"],"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":"Craft CMS Cross-site Scripting Vulnerability","id":"CVE-2021-27902","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"craftcms:craft_cms","products":["craftcms:craft_cms"],"type":"xss","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Craft CMS Remote Code Injection","id":"CVE-2021-27903"},"packages":[{"ecosystem":"Packagist","fixed":["3.6.0"],"introduced":["0"],"last_affected":[],"package":"craftcms/cms","purl":null,"source":"GHSA-3jxh-789f-p7m6"},{"ecosystem":"Packagist","fixed":["3.6.0"],"introduced":["0"],"last_affected":[],"package":"craftcms/cms","purl":"pkg:composer/craftcms/cms","source":"GHSA-3jxh-789f-p7m6"}],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2021-27901"},"products":["n/a"],"published":"2021-06-30","related":[{"cvss_score":10,"headline":"Craft CMS Code Injection","id":"CVE-2025-32432","kev_date_added":"2026-03-20","published":"2025-04-25"},{"cvss_score":9.3,"headline":"Craft CMS Code Injection","id":"CVE-2024-56145","kev_date_added":"2025-06-02","published":"2024-12-18"},{"cvss_score":8.1,"headline":"Craft CMS Code Injection","id":"CVE-2025-23209","kev_date_added":"2025-02-20","published":"2025-01-18"},{"cvss_score":6.9,"headline":"Craft CMS External Control of Assumed-Immutable Web Parameter","id":"CVE-2025-35939","kev_date_added":"2025-06-02","published":"2025-05-07"},{"cvss_score":10,"headline":"Craft CMS Remote Code Execution vulnerability","id":"CVE-2023-41892","kev_date_added":null,"published":"2023-09-13"},{"cvss_score":9.8,"headline":"Craft CMS Remote Code Injection","id":"CVE-2021-27903","kev_date_added":null,"published":"2021-06-30"},{"cvss_score":9.8,"headline":"SEOmatic for CraftCMS allows Server-Side Template Injection","id":"CVE-2020-9757","kev_date_added":null,"published":"2020-03-04"}],"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":"2024-08-03","vendors":["n/a"]},"summary":"An XSS vulnerability in Craft CMS front-end forms allows attackers to inject malicious scripts via user uploads.","url":"https://insights.sbomify.com/CVE-2021-27902/"}