{"answers":{"affected":"4 open source packages ship an affected version, including kunstmaan/bundles-cms and kunstmaan/media-bundle.","exploited":"There is no known exploitation of CVE-2026-104890 in the wild and no public exploit code.","fix":"Upgrade kunstmaan/bundles-cms to 7.3.2 or later.","what":"CVE-2026-104890 is a high-severity vulnerability in KunstmaanBundlesCMS, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-104890 and fix it if it is affected.\n\nWhat it is: CVE-2026-104890 is a high-severity vulnerability in KunstmaanBundlesCMS, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-104890 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- kunstmaan/bundles-cms (Packagist): affected all versions; fixed in 7.3.2\n- kunstmaan/bundles-cms (Packagist): affected all versions; fixed in 7.3.2\n- kunstmaan/media-bundle (Packagist): affected all versions; fixed in 7.3.2\n- kunstmaan/media-bundle (Packagist): affected all versions; fixed in 7.3.2\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-2026-104890/ (Markdown: https://insights.sbomify.com/CVE-2026-104890/index.md)","id":"CVE-2026-104890","markdown":"https://insights.sbomify.com/CVE-2026-104890/index.md","name":"CVE-2026-104890","record":{"aliases":["GHSA-p279-5wcv-45vq"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Kunstmaan CMS","requires_auth":"high_privilege","summary":"Authenticated administrators can bypass file extension blacklists to upload executable PHP files, resulting in remote code execution.","user_interaction":"not_required","vuln_class":"file_upload"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"description":"Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2.","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":"Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution","id":"CVE-2026-104890","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"file_upload","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"mppx-condition-gate: Free-access path grants on a self-declared wallet without proving control","id":"CVE-2026-104891"},"packages":[{"ecosystem":"Packagist","fixed":["7.3.2"],"introduced":["0"],"last_affected":[],"package":"kunstmaan/bundles-cms","purl":null,"source":"GHSA-p279-5wcv-45vq"},{"ecosystem":"Packagist","fixed":["7.3.2"],"introduced":["0"],"last_affected":[],"package":"kunstmaan/bundles-cms","purl":"pkg:composer/kunstmaan/bundles-cms","source":"GHSA-p279-5wcv-45vq"},{"ecosystem":"Packagist","fixed":["7.3.2"],"introduced":["0"],"last_affected":[],"package":"kunstmaan/media-bundle","purl":null,"source":"GHSA-p279-5wcv-45vq"},{"ecosystem":"Packagist","fixed":["7.3.2"],"introduced":["0"],"last_affected":[],"package":"kunstmaan/media-bundle","purl":"pkg:composer/kunstmaan/media-bundle","source":"GHSA-p279-5wcv-45vq"}],"prev":{"headline":"Ente: Accepted emergency contact can bypass the recovery notice period","id":"CVE-2026-104875"},"products":["KunstmaanBundlesCMS","bundles-cms","media-bundle"],"published":"2026-10-05","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":"total"},"state":"PUBLISHED","updated":"2026-10-07","vendors":["Kunstmaan","kunstmaan"]},"summary":"Authenticated administrators can bypass file extension blacklists to upload executable PHP files, resulting in remote code execution.","url":"https://insights.sbomify.com/CVE-2026-104890/"}