{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-32656 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-32656 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-32656 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 1 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-32656 and fix it if it is affected.\n\nWhat it is: CVE-2021-32656 is a high-severity vulnerability in Nextcloud Nextcloud Server, published on 1 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-32656 in the wild and no public exploit code.\n\nAffected product: Nextcloud Nextcloud Server. 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-2021-32656/ (Markdown: https://insights.sbomify.com/CVE-2021-32656/index.md)","id":"CVE-2021-32656","markdown":"https://insights.sbomify.com/CVE-2021-32656/index.md","name":"CVE-2021-32656","record":{"aliases":["GHSA-j875-vr2q-h6x6"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"Nextcloud Server","requires_auth":"none","summary":"An attacker can access basic user information via a public link if automatic trusted server addition is enabled in Nextcloud.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"nextcloud_server","vendor":"nextcloud"}],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"}],"description":"Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the \"Add server automatically once a federated share was created successfully\" setting. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable \"Add server automatically once a federated share was created successfully\" in the Nextcloud settings.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Trusted servers exchange can be triggered by attacker","id":"CVE-2021-32656","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"nextcloud:nextcloud_server","products":["nextcloud:nextcloud_server"],"type":"information_disclosure","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"Malicious user could break user administration page","id":"CVE-2021-32657"},"packages":[],"prev":{"headline":"Files Drop public link can be added as federated share","id":"CVE-2021-32655"},"products":["security-advisories"],"published":"2021-06-01","related":[{"cvss_score":9.3,"headline":"Preview generation used third-party library not suited for user-generated content in Nextcloud server","id":"CVE-2021-32802","kev_date_added":null,"published":"2021-09-07"},{"cvss_score":9.1,"headline":"Scope of workflow operations is not validated in nextcloud server","id":"CVE-2023-26482","kev_date_added":null,"published":"2023-03-30"},{"cvss_score":8.8,"headline":"Auth bypass in Nextcloud Server","id":"CVE-2018-3775","kev_date_added":null,"published":"2018-08-12"},{"cvss_score":8.7,"headline":"Nextcloud Server password reset endpoint is not brute force protected","id":"CVE-2023-35172","kev_date_added":null,"published":"2023-06-23"},{"cvss_score":8.7,"headline":"Nextcloud Server's brute force protection allows someone to send more requests than intended","id":"CVE-2023-32320","kev_date_added":null,"published":"2023-06-22"},{"cvss_score":8.5,"headline":"Nextcloud Server users can make external storage mount points inaccessible for other users","id":"CVE-2023-48239","kev_date_added":null,"published":"2023-11-21"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["nextcloud"]},"summary":"An attacker can access basic user information via a public link if automatic trusted server addition is enabled in Nextcloud.","url":"https://insights.sbomify.com/CVE-2021-32656/"}