{"id":"CVE-2025-66556","aliases":["EUVD-2025-201458","GHSA-pr9f-vqgg-m2jh"],"status":"published","title":"Nextcloud talk allows participants to blindly delete poll drafts of other users by ID","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.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00272,"percentile":0.19721,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2025-12-05T17:56:44Z","modified":"2026-10-28T02:31:09Z","products":[{"vendor":"kiteworks","product":"security-advisories"},{"vendor":"nextcloud","product":"security-advisories"},{"vendor":"nextcloud","product":"talk"}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory"]},{"url":"https://github.com/nextcloud/spreed/pull/15532","tags":["x_refsource_MISC","Issue Tracking","Patch","fix"]},{"url":"https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://hackerone.com/reports/3247386","tags":["x_refsource_MISC","Issue Tracking","Vendor Advisory","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66556.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66556","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-66556","title":"Nextcloud talk allows participants to blindly delete poll drafts of other users by ID","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.","status":"published","published":"2025-12-05T17:56:44.463Z","modified":"2025-12-05T18:09:34.326Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:32:53.157279Z"}],"euvd":[{"id":"EUVD-2025-201458","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.","status":"published","published":"2025-12-05T17:56:44Z","modified":"2025-12-05T18:09:34Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T19:49:09.437744Z"}],"nvd":[{"id":"CVE-2025-66556","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.","status":"published","published":"2025-12-05T18:15:58.803Z","modified":"2026-10-15T21:10:00.327Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:11:49.093461Z"}],"osv":[{"id":"CVE-2025-66556","title":"Nextcloud talk allows participants to blindly delete poll drafts of other users by ID","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.","status":"published","published":"2025-12-05T17:56:44.463Z","modified":"2026-10-28T02:31:09.991463357Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:44:52.202386Z"}]}}