{"answers":{"affected":"2 open source packages ship an affected version, including getgrav/grav. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-3818 in the wild and no public exploit code.","fix":"Upgrade getgrav/grav to 1.7.21 or later.","what":"CVE-2021-3818 is a medium-severity vulnerability in Getgrav Grav, published on 27 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-3818 and fix it if it is affected.\n\nWhat it is: CVE-2021-3818 is a medium-severity vulnerability in Getgrav Grav, published on 27 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-3818 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- getgrav/grav (Packagist): affected all versions; fixed in 1.7.21\n- getgrav/grav (Packagist): affected all versions; fixed in 1.7.21\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-2021-3818/ (Markdown: https://insights.sbomify.com/CVE-2021-3818/index.md)","id":"CVE-2021-3818","markdown":"https://insights.sbomify.com/CVE-2021-3818/index.md","name":"CVE-2021-3818","record":{"aliases":["GHSA-cg3q-59w7-rvc2"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Grav CMS","requires_auth":"low_privilege","summary":"Attackers can bypass security controls in Grav CMS by exploiting cookies that lack validation and integrity checks.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntrdev","cpe":[{"product":"grav","vendor":"getgrav"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","version":"3.0"},"cwes":[{"id":"CWE-565","name":"Reliance on Cookies without Validation and Integrity Checking"}],"description":"grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking","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":"Reliance on Cookies without Validation and Integrity Checking in getgrav/grav","id":"CVE-2021-3818","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"getgrav:grav","products":["getgrav:grav"],"type":"security_feature_bypass","year":"2021"},"n_packages":2,"n_references":2,"next":{"headline":"Cross-Site Request Forgery (CSRF) in firefly-iii/firefly-iii","id":"CVE-2021-3819"},"packages":[{"ecosystem":"Packagist","fixed":["1.7.21"],"introduced":["0"],"last_affected":[],"package":"getgrav/grav","purl":null,"source":"GHSA-cg3q-59w7-rvc2"},{"ecosystem":"Packagist","fixed":["1.7.21"],"introduced":["0"],"last_affected":[],"package":"getgrav/grav","purl":"pkg:composer/getgrav/grav","source":"GHSA-cg3q-59w7-rvc2"}],"prev":{"headline":"SQL Injection in wbce/wbce_cms","id":"CVE-2021-3817"},"products":["getgrav/grav"],"published":"2021-09-27","related":[{"cvss_score":10,"headline":"Grav Server Side Template Injection vulnerability","id":"CVE-2023-34251","kev_date_added":null,"published":"2023-06-14"},{"cvss_score":9.8,"headline":"Cross-site scripting in n/a","id":"CVE-2025-46199","kev_date_added":null,"published":"2025-07-25"},{"cvss_score":9.3,"headline":"GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)","id":"CVE-2021-47812","kev_date_added":null,"published":"2026-01-15"},{"cvss_score":9.1,"headline":"Grav may be vulnerable to SSRF attack via Twig Templates","id":"CVE-2025-66844","kev_date_added":null,"published":"2025-12-15"},{"cvss_score":9.1,"headline":"Code Injection in getgrav/grav","id":"CVE-2022-2073","kev_date_added":null,"published":"2022-06-29"},{"cvss_score":8.9,"headline":"Grav: Stored XSS via Tag Injection","id":"CVE-2026-42611","kev_date_added":null,"published":"2026-05-11"},{"cvss_score":8.8,"headline":"Grav: Unauthenticated Path Traversal \u0026 Arbitrary File Write in FormFlash component.","id":"CVE-2026-42608","kev_date_added":null,"published":"2026-05-11"}],"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":"2024-08-03","vendors":["getgrav"]},"summary":"Attackers can bypass security controls in Grav CMS by exploiting cookies that lack validation and integrity checks.","url":"https://insights.sbomify.com/CVE-2021-3818/"}