---
id: CVE-2025-66556
title: Nextcloud talk is a video & audio conferencing app for Nextcloud
summary: >-
  Nextcloud talk is a video & 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. Thi…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-639
vendor: nextcloud
product: talk
affected:
  - 'talk >= 20.0.0, < 20.1.8'
  - 'talk >= 21.0.0, < 21.1.2'
patched:
  - talk 21.1.2
published: '2025-12-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:10:00.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66556'
references:
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh
    label: security-advisories@github.com
  - url: >-
      https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/spreed/pull/15532'
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3247386'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00253
epssPercentile: 0.16757
ingestedAt: '2026-10-27T18:12:09.280Z'
---

## Overview

Nextcloud talk is a video & 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.

## Affected

- `talk >= 20.0.0, < 20.1.8`
- `talk >= 21.0.0, < 21.1.2`

## Remediation

Upgrade past the affected range:

- `talk 21.1.2`