Nextcloud Talk Poll Draft Deletion (CVE-2025-66556) fixed in 20.1.8/21.1.2
CVE-2025-66556 Published on December 5, 2025
Nextcloud talk allows participants to blindly delete poll drafts of other users by ID
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.
Vulnerability Analysis
CVE-2025-66556 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2025-66556 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2025-66556
Want to know whenever a new CVE is published for Nextcloud Talk? stack.watch will email you.
Affected Versions
nextcloud security-advisories:- Version < 20.1.8 is affected.
- Version >= 21.0.0-beta.1, < 21.1.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.