{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-28997 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2023-28997 is a medium-severity 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-2023-28997 and fix it if it is affected.\n\nWhat it is: CVE-2023-28997 is a medium-severity 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-2023-28997 in the wild and no public exploit code.\n\nAffected product: nextcloud security-advisories. 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-2023-28997/ (Markdown: https://insights.sbomify.com/CVE-2023-28997/index.md)","id":"CVE-2023-28997","markdown":"https://insights.sbomify.com/CVE-2023-28997/index.md","name":"CVE-2023-28997","record":{"aliases":["DEBIAN-CVE-2023-28997","GHSA-4p33-rw27-j5fc","UBUNTU-CVE-2023-28997"],"analysis":{"component_type":"desktop_application","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Nextcloud Desktop Client","requires_auth":"high_privilege","summary":"A malicious server admin can recover and modify end-to-end encrypted files due to initialization vector reuse in the Nextcloud Desktop Client.","user_interaction":"required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"desktop","vendor":"nextcloud"}],"cvss":{"score":6.7,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-323","name":"Reusing a Nonce, Key Pair in Encryption"}],"description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","ecosystems":[],"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 Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","id":"CVE-2023-28997","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys","id":"CVE-2023-28998"},"packages":[],"prev":{"headline":"WordPress Configurable Tag Cloud Plugin \u003c= 5.2 is vulnerable to Cross Site Request Forgery (CSRF)","id":"CVE-2023-28995"},"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":6.9,"headline":"Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders","id":"CVE-2023-28999","kev_date_added":null,"published":"2023-04-04"},{"cvss_score":6.8,"headline":"Path traversal in Desktop Client","id":"CVE-2020-8227","kev_date_added":null,"published":"2020-08-21"}],"sources":[{"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":"2025-11-03","vendors":["nextcloud"]},"summary":"A malicious server admin can recover and modify end-to-end encrypted files due to initialization vector reuse in the Nextcloud Desktop Client.","url":"https://insights.sbomify.com/CVE-2023-28997/"}