{"answers":{"affected":"1 open source package ship an affected version, including nextcloud. It affects 2 products.","exploited":"There is no known exploitation of CVE-2023-28999 in the wild and no public exploit code.","fix":"Upgrade nextcloud to 4.8.0 or later.","what":"CVE-2023-28999 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 4 Apr 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2023-28999 and fix it if it is affected.\n\nWhat it is: CVE-2023-28999 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 4 Apr 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2023-28999 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- nextcloud (Bitnami): affected from 3.0.5; fixed in 4.8.0\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-2023-28999/ (Markdown: https://insights.sbomify.com/CVE-2023-28999/index.md)","id":"CVE-2023-28999","markdown":"https://insights.sbomify.com/CVE-2023-28999/index.md","name":"CVE-2023-28999","record":{"aliases":["BIT-nextcloud-2023-28999","DEBIAN-CVE-2023-28999","GHSA-8875-wxww-3rr8","UBUNTU-CVE-2023-28999"],"analysis":{"component_type":"mobile_application","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Nextcloud client apps","requires_auth":"high_privilege","summary":"A malicious server admin can bypass E2EE protections to decrypt, read, and modify files in encrypted folders via Nextcloud clients.","user_interaction":"required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"desktop","vendor":"nextcloud"},{"product":"nextcloud","vendor":"nextcloud"}],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-311","name":"Missing Encryption of Sensitive Data"},{"id":"CWE-325","name":"Missing Cryptographic Step"}],"description":"Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure and add new files.​ This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.","ecosystems":["Bitnami"],"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":"Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders","id":"CVE-2023-28999","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"missing_authorization","year":"2023"},"n_packages":1,"n_references":3,"next":{"headline":"Nextcloud Desktop client does not verify received singed certificate in end-to-end encryption","id":"CVE-2023-29000"},"packages":[{"ecosystem":"Bitnami","fixed":["4.8.0"],"introduced":["3.0.5"],"last_affected":[],"package":"nextcloud","purl":"pkg:bitnami/nextcloud","source":"BIT-nextcloud-2023-28999"}],"prev":{"headline":"Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys","id":"CVE-2023-28998"},"products":["security-advisories"],"published":"2023-04-04","related":[{"cvss_score":9.1,"headline":"Misconfiguration in n/a","id":"CVE-2024-46958","kev_date_added":null,"published":"2024-09-16"},{"cvss_score":7.8,"headline":"Code injection in Desktop Client","id":"CVE-2020-8224","kev_date_added":null,"published":"2020-08-10"},{"cvss_score":7.5,"headline":"Information disclosure in Desktop Client","id":"CVE-2020-8225","kev_date_added":null,"published":"2020-09-18"},{"cvss_score":7.3,"headline":"Untrusted Search Path in Nextcloud Desktop Client","id":"CVE-2021-37617","kev_date_added":null,"published":"2021-08-18"},{"cvss_score":6.8,"headline":"Path traversal in Desktop Client","id":"CVE-2020-8227","kev_date_added":null,"published":"2020-08-21"},{"cvss_score":6.7,"headline":"Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","id":"CVE-2023-28997","kev_date_added":null,"published":"2023-04-04"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2025-02-11","vendors":["nextcloud"]},"summary":"A malicious server admin can bypass E2EE protections to decrypt, read, and modify files in encrypted folders via Nextcloud clients.","url":"https://insights.sbomify.com/CVE-2023-28999/"}