{"answers":{"affected":"2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-8134 in the wild and no public exploit code.","fix":"Upgrade concrete5/concrete5 to 9.5.1 or later.","what":"CVE-2026-8134 is a critical path traversal vulnerability in Concretecms Concrete Cms, published on 21 May 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-8134 and fix it if it is affected.\n\nWhat it is: CVE-2026-8134 is a critical path traversal vulnerability in Concretecms Concrete Cms, published on 21 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-8134 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- concrete5/concrete5 (Packagist): affected all versions; fixed in 9.5.1\n- concrete5/concrete5 (Packagist): affected all versions; fixed in 9.5.1\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-2026-8134/ (Markdown: https://insights.sbomify.com/CVE-2026-8134/index.md)","id":"CVE-2026-8134","markdown":"https://insights.sbomify.com/CVE-2026-8134/index.md","name":"CVE-2026-8134","record":{"aliases":["GHSA-645j-cm4x-3xvw"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Concrete CMS","requires_auth":"high_privilege","summary":"Authenticated administrators can achieve remote code execution via path traversal in Composer form layouts combined with insufficient file upload validation.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"ConcreteCMS","cpe":[{"product":"concrete_cms","vendor":"concretecms"}],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"},{"id":"CWE-98","name":"Improper Control of Filename for Include/Require Statement in PHP Program"},{"id":"CWE-23","name":"Relative Path Traversal"}],"description":"Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary readable files on the server. Combined with the file uploader's extension-only validation (which permits PHP code in files saved with image extensions like .png), this can result in authenticated remote code execution. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H   Thanks Yonatan Drori (Tenzai) for reporting.","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":"Concrete CMS Vulnerable to Relative Path Traversal","id":"CVE-2026-8134","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"concretecms:concrete_cms","products":["concretecms:concrete_cms"],"type":"path_traversal","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Concrete CMS Vulnerable to Deserialization of Untrusted Data","id":"CVE-2026-8135"},"packages":[{"ecosystem":"Packagist","fixed":["9.5.1"],"introduced":["0"],"last_affected":[],"package":"concrete5/concrete5","purl":null,"source":"GHSA-645j-cm4x-3xvw"},{"ecosystem":"Packagist","fixed":["9.5.1"],"introduced":["0"],"last_affected":[],"package":"concrete5/concrete5","purl":"pkg:composer/concrete5/concrete5","source":"GHSA-645j-cm4x-3xvw"}],"prev":{"headline":"zyx0814 FilePress Shares Filelist API admin.php sql injection","id":"CVE-2026-8133"},"products":["Concrete CMS"],"published":"2026-05-21","related":[{"cvss_score":9.8,"headline":"Concrete CMS allows unauthorized access because directories can be created with insecure permissions","id":"CVE-2023-48648","kev_date_added":null,"published":"2023-11-17"},{"cvss_score":9.8,"headline":"Code injection in concrete CMS","id":"CVE-2022-21829","kev_date_added":null,"published":"2022-06-24"},{"cvss_score":9.8,"headline":"Server-Side Request Forgery vulnerability in concrete5","id":"CVE-2021-22958","kev_date_added":null,"published":"2021-10-07"},{"cvss_score":9.8,"headline":"Path traversal in n/a","id":"CVE-2021-40098","kev_date_added":null,"published":"2021-09-27"},{"cvss_score":9.1,"headline":"Path traversal in Concrete CMS","id":"CVE-2022-30117","kev_date_added":null,"published":"2022-06-24"},{"cvss_score":9.1,"headline":"Deserialization in n/a","id":"CVE-2021-40102","kev_date_added":null,"published":"2021-09-24"}],"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-22","vendors":["Concrete CMS"]},"summary":"Authenticated administrators can achieve remote code execution via path traversal in Composer form layouts combined with insufficient file upload validation.","url":"https://insights.sbomify.com/CVE-2026-8134/"}