{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53956 exists.","fix":"No fix has been published for CVE-2023-53956 yet. Limit exposure of the affected software until one is available.","what":"CVE-2023-53956 is a high-severity vulnerability in altervista flatnux, published on 19 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-53956 and fix it if it is affected.\n\nWhat it is: CVE-2023-53956 is a high-severity vulnerability in altervista flatnux, published on 19 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53956 exists.\n\nAffected product: altervista flatnux. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2023-53956/ (Markdown: https://insights.sbomify.com/CVE-2023-53956/index.md)","id":"CVE-2023-53956","markdown":"https://insights.sbomify.com/CVE-2023-53956/index.md","name":"CVE-2023-53956","record":{"aliases":["GHSA-r9qg-6q9c-jpvx"],"analysis":{"component_type":"web_application","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Flatnux CMS","requires_auth":"low_privilege","summary":"Administrative users can upload arbitrary PHP files to the web root, enabling remote code execution on the server.","user_interaction":"not_required","vuln_class":"file_upload"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"}],"description":"Flatnux 2021-03.25 contains an authenticated file upload vulnerability that allows administrative users to upload arbitrary PHP files through the file manager. Attackers with admin credentials can upload malicious PHP scripts to the web root directory, enabling remote code execution on the server.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"Flatnux 2021-03.25 Authenticated File Upload Remote Code Execution","id":"CVE-2023-53956","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"file_upload","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"Kimai 1.30.10 SameSite Cookie Vulnerability Session Hijacking","id":"CVE-2023-53957"},"packages":[],"prev":{"headline":"SOUND4 IMPACT/FIRST/PULSE/Eco v2.x Authorization Bypass via Insecure Object References","id":"CVE-2023-53955"},"products":["flatnux"],"published":"2025-12-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-07","vendors":["altervista"]},"summary":"Administrative users can upload arbitrary PHP files to the web root, enabling remote code execution on the server.","url":"https://insights.sbomify.com/CVE-2023-53956/"}