{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-66557 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-66557 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-66557 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 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-2025-66557 and fix it if it is affected.\n\nWhat it is: CVE-2025-66557 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-66557 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-2025-66557/ (Markdown: https://insights.sbomify.com/CVE-2025-66557/index.md)","id":"CVE-2025-66557","markdown":"https://insights.sbomify.com/CVE-2025-66557/index.md","name":"CVE-2025-66557","record":{"aliases":["GHSA-wwr8-hx9g-rjvv"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Nextcloud Deck app","requires_auth":"low_privilege","summary":"Users with share permissions could improperly modify other users' permissions, requiring an upgrade to the Nextcloud Deck app.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"deck","vendor":"nextcloud"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"}],"description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with \"Can share\" permission to modify the permissions of other recipients. This vulnerability is fixed in 1.14.6 and 1.15.2.","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":"Nextcloud Deck app allowed user with \"Can share\" permission to modify permissions of other non-owners","id":"CVE-2025-66557","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"Nextcloud Twofactor WebAuthn app was updated based on public key","id":"CVE-2025-66558"},"packages":[],"prev":{"headline":"Nextcloud talk allows participants to blindly delete poll drafts of other users by ID","id":"CVE-2025-66556"},"products":["security-advisories"],"published":"2025-12-05","related":[{"cvss_score":8.1,"headline":"Missing permission check on Deck API","id":"CVE-2021-39225","kev_date_added":null,"published":"2021-10-25"},{"cvss_score":8,"headline":"Missing authorization in Nextcloud Deck","id":"CVE-2020-8182","kev_date_added":null,"published":"2020-10-05"},{"cvss_score":6.5,"headline":"Circle can be accessed by non-Circle members in Nextcloud Deck","id":"CVE-2021-37631","kev_date_added":null,"published":"2021-09-07"},{"cvss_score":6.5,"headline":"Information disclosure in Nextcloud Deck","id":"CVE-2021-22913","kev_date_added":null,"published":"2021-06-11"},{"cvss_score":5.8,"headline":"Nextcloud Deck card vulnerable to data leak to unauthorized users via reference preview cache","id":"CVE-2023-22469","kev_date_added":null,"published":"2023-01-10"},{"cvss_score":5,"headline":"Possibility for anyone to add a stack with existing tasks on anyone's board in Nextcloud Deck","id":"CVE-2022-29159","kev_date_added":null,"published":"2022-05-20"}],"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":"partial"},"state":"PUBLISHED","updated":"2025-12-08","vendors":["nextcloud"]},"summary":"Users with share permissions could improperly modify other users' permissions, requiring an upgrade to the Nextcloud Deck app.","url":"https://insights.sbomify.com/CVE-2025-66557/"}