{"answers":{"affected":"4 open source packages ship an affected version, including craftcms/cms.","exploited":"There is no known exploitation of CVE-2026-56384 in the wild and no public exploit code.","fix":"Upgrade craftcms/cms to a fixed version for your release line: 4.17.8 or 5.9.14.","what":"CVE-2026-56384 is a medium-severity missing authorization vulnerability in craftcms cms, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-56384 and fix it if it is affected.\n\nWhat it is: CVE-2026-56384 is a medium-severity missing authorization vulnerability in craftcms cms, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-56384 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.8\n- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.8\n- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.14\n- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.14\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-2026-56384/ (Markdown: https://insights.sbomify.com/CVE-2026-56384/index.md)","id":"CVE-2026-56384","markdown":"https://insights.sbomify.com/CVE-2026-56384/index.md","name":"CVE-2026-56384","record":{"aliases":["GHSA-x76w-8c62-48mg"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Craft CMS","requires_auth":"low_privilege","summary":"Craft CMS allows unauthorized users to view private asset previews due to missing permission checks in the preview-thumb endpoint.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"}],"description":"Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions \u003e= 4.0.0-RC1, \u003c= 4.17.7 and \u003e= 5.0.0-RC1, \u003c= 5.9.13, and is fixed in 4.17.8 and 5.9.14.","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 - Missing Authorization in assets/preview-thumb Endpoint","id":"CVE-2026-56384","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"Craft CMS - Authorization Bypass in assets/preview-file Endpoint","id":"CVE-2026-56385"},"packages":[{"ecosystem":"Packagist","fixed":["4.17.8"],"introduced":["4.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":null,"source":"GHSA-x76w-8c62-48mg"},{"ecosystem":"Packagist","fixed":["4.17.8"],"introduced":["4.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":"pkg:composer/craftcms/cms","source":"GHSA-x76w-8c62-48mg"},{"ecosystem":"Packagist","fixed":["5.9.14"],"introduced":["5.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":null,"source":"GHSA-x76w-8c62-48mg"},{"ecosystem":"Packagist","fixed":["5.9.14"],"introduced":["5.0.0-RC1"],"last_affected":[],"package":"craftcms/cms","purl":"pkg:composer/craftcms/cms","source":"GHSA-x76w-8c62-48mg"}],"prev":{"headline":"Craft CMS - Stored XSS in Table Field via Row Heading Column Type","id":"CVE-2026-56383"},"products":["cms"],"published":"2026-06-21","related":[],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-24","vendors":["craftcms"]},"summary":"Craft CMS allows unauthorized users to view private asset previews due to missing permission checks in the preview-thumb endpoint.","url":"https://insights.sbomify.com/CVE-2026-56384/"}