{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-66556 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-66556 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-66556 is a low-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2025-66556 and fix it if it is affected.\n\nWhat it is: CVE-2025-66556 is a low-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2025-66556 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-2025-66556/ (Markdown: https://insights.sbomify.com/CVE-2025-66556/index.md)","id":"CVE-2025-66556","markdown":"https://insights.sbomify.com/CVE-2025-66556/index.md","name":"CVE-2025-66556","record":{"aliases":["GHSA-pr9f-vqgg-m2jh"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Nextcloud Talk","requires_auth":"low_privilege","summary":"A participant can delete other users' poll drafts by guessing IDs, allowing unauthorized data modification in Nextcloud Talk.","user_interaction":"required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"talk","vendor":"nextcloud"}],"cvss":{"score":3.5,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"description":"Nextcloud talk is a video \u0026 audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat permissions was able to delete poll drafts of other participants within the conversation based on their numeric ID. This vulnerability is fixed in 20.1.8 and 21.1.2.","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 talk allows participants to blindly delete poll drafts of other users by ID","id":"CVE-2025-66556","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 Deck app allowed user with \"Can share\" permission to modify permissions of other non-owners","id":"CVE-2025-66557"},"packages":[],"prev":{"headline":"AirKeyboard iOS App 1.0.5 - Remote Input Injection","id":"CVE-2025-66555"},"products":["security-advisories"],"published":"2025-12-05","related":[{"cvss_score":9.9,"headline":"Code injection in Nextcloud Talk","id":"CVE-2020-8180","kev_date_added":null,"published":"2020-06-08"},{"cvss_score":8.1,"headline":"Nextcloud Talk not properly disassociating users from chats after account deletion","id":"CVE-2021-32689","kev_date_added":null,"published":"2021-07-12"},{"cvss_score":7.2,"headline":"Path traversal allows tricking the Talk Android app into writing files into it's root directory","id":"CVE-2023-39957","kev_date_added":null,"published":"2023-08-10"},{"cvss_score":6.5,"headline":"Session Fixation in Nextcloud Talk","id":"CVE-2021-32676","kev_date_added":null,"published":"2021-06-16"},{"cvss_score":6.4,"headline":"XSS in Talk","id":"CVE-2021-39222","kev_date_added":null,"published":"2021-11-15"},{"cvss_score":5.4,"headline":"Cross-site scripting in nextcloud/talk","id":"CVE-2018-3781","kev_date_added":null,"published":"2018-08-13"},{"cvss_score":4.7,"headline":"Geolocation preview links can be set to arbitrary links in nextcloud talk","id":"CVE-2021-41180","kev_date_added":null,"published":"2022-03-08"}],"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":"2025-12-05","vendors":["nextcloud"]},"summary":"A participant can delete other users' poll drafts by guessing IDs, allowing unauthorized data modification in Nextcloud Talk.","url":"https://insights.sbomify.com/CVE-2025-66556/"}