{"answers":{"affected":"12 open source packages ship an affected version, including contao/contao and contao/core-bundle. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-35955 in the wild and no public exploit code.","fix":"Upgrade contao/contao to a fixed version for your release line: 4.4.56, 4.11.7 or 4.9.18.","what":"CVE-2021-35955 is a medium-severity cross-site scripting vulnerability in n/a, published on 12 Aug 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-35955 and fix it if it is affected.\n\nWhat it is: CVE-2021-35955 is a medium-severity cross-site scripting vulnerability in n/a, published on 12 Aug 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-35955 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- contao/contao (Packagist): affected from 4.0.0; fixed in 4.4.56\n- contao/contao (Packagist): affected from 4.0.0; fixed in 4.4.56\n- contao/contao (Packagist): affected from 4.10.0; fixed in 4.11.7\n- contao/contao (Packagist): affected from 4.10.0; fixed in 4.11.7\n- contao/contao (Packagist): affected from 4.5.0; fixed in 4.9.18\n- contao/contao (Packagist): affected from 4.5.0; fixed in 4.9.18\n- contao/core-bundle (Packagist): affected from 4.0.0; fixed in 4.4.56\n- contao/core-bundle (Packagist): affected from 4.0.0; fixed in 4.4.56\n- contao/core-bundle (Packagist): affected from 4.10.0; fixed in 4.11.7\n- contao/core-bundle (Packagist): affected from 4.10.0; fixed in 4.11.7\n- contao/core-bundle (Packagist): affected from 4.5.0; fixed in 4.9.18\n- contao/core-bundle (Packagist): affected from 4.5.0; fixed in 4.9.18\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-2021-35955/ (Markdown: https://insights.sbomify.com/CVE-2021-35955/index.md)","id":"CVE-2021-35955","markdown":"https://insights.sbomify.com/CVE-2021-35955/index.md","name":"CVE-2021-35955","record":{"aliases":["GHSA-hr3h-x6gq-rqcp"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Contao CMS","requires_auth":"high_privilege","summary":"An attacker can inject malicious scripts into backend HTML fields, potentially leading to code execution or account takeover in Contao CMS.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"contao","vendor":"contao"}],"cvss":{"score":4.8,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:H/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":"Contao \u003e=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7.","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":"Cross site scripting via HTML attributes in the back end","id":"CVE-2021-35955","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":12,"n_references":2,"next":{"headline":"Cross-site scripting in n/a","id":"CVE-2021-35956"},"packages":[{"ecosystem":"Packagist","fixed":["4.4.56"],"introduced":["4.0.0"],"last_affected":[],"package":"contao/contao","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.4.56"],"introduced":["4.0.0"],"last_affected":[],"package":"contao/contao","purl":"pkg:composer/contao/contao","source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.11.7"],"introduced":["4.10.0"],"last_affected":[],"package":"contao/contao","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.11.7"],"introduced":["4.10.0"],"last_affected":[],"package":"contao/contao","purl":"pkg:composer/contao/contao","source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.9.18"],"introduced":["4.5.0"],"last_affected":[],"package":"contao/contao","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.9.18"],"introduced":["4.5.0"],"last_affected":[],"package":"contao/contao","purl":"pkg:composer/contao/contao","source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.4.56"],"introduced":["4.0.0"],"last_affected":[],"package":"contao/core-bundle","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.4.56"],"introduced":["4.0.0"],"last_affected":[],"package":"contao/core-bundle","purl":"pkg:composer/contao/core-bundle","source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.11.7"],"introduced":["4.10.0"],"last_affected":[],"package":"contao/core-bundle","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.11.7"],"introduced":["4.10.0"],"last_affected":[],"package":"contao/core-bundle","purl":"pkg:composer/contao/core-bundle","source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.9.18"],"introduced":["4.5.0"],"last_affected":[],"package":"contao/core-bundle","purl":null,"source":"GHSA-hr3h-x6gq-rqcp"},{"ecosystem":"Packagist","fixed":["4.9.18"],"introduced":["4.5.0"],"last_affected":[],"package":"contao/core-bundle","purl":"pkg:composer/contao/core-bundle","source":"GHSA-hr3h-x6gq-rqcp"}],"prev":{"headline":"Security feature bypass in n/a","id":"CVE-2021-35954"},"products":["n/a"],"published":"2021-08-12","related":[{"cvss_score":9.8,"headline":"Remote Code Execution in Contao Managed Edition","id":"CVE-2022-26265","kev_date_added":null,"published":"2022-03-18"},{"cvss_score":9.8,"headline":"Contao SQL injection in the file manager","id":"CVE-2019-11512","kev_date_added":null,"published":"2019-07-09"},{"cvss_score":8.8,"headline":"Contao core SQL Injection Vulnerability","id":"CVE-2012-4383","kev_date_added":null,"published":"2020-01-29"},{"cvss_score":8.8,"headline":"Unrestricted file uploads in Contao","id":"CVE-2019-19745","kev_date_added":null,"published":"2019-12-17"},{"cvss_score":8.4,"headline":"Contao possible cookie sharing with external domains while checking protected pages for broken links","id":"CVE-2024-28235","kev_date_added":null,"published":"2024-04-09"},{"cvss_score":8.3,"headline":"Remote command execution through file upload in contao/core-bundle","id":"CVE-2024-45398","kev_date_added":null,"published":"2024-09-17"},{"cvss_score":8,"headline":"Privilege escalation via form generator","id":"CVE-2021-37627","kev_date_added":null,"published":"2021-08-11"}],"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":"An attacker can inject malicious scripts into backend HTML fields, potentially leading to code execution or account takeover in Contao CMS.","url":"https://insights.sbomify.com/CVE-2021-35955/"}