CVE-2025-66556
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-05

Last updated on: 2025-12-09

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2025-12-05
Last Modified
2025-12-09
Generated
2026-06-16
AI Q&A
2025-12-05
EPSS Evaluated
2026-06-15
NVD
CVE-2025-66556
EUVD
EUVD-2025-201458
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
nextcloud talk From 20.0.0 (inc) to 20.1.8 (exc)
nextcloud talk From 21.0.0 (inc) to 21.1.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 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.
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Executive Summary

This vulnerability in Nextcloud Talk allowed a participant who had chat permissions to delete poll drafts created by other participants within the conversation by exploiting the numeric ID of the drafts. This issue existed in versions prior to 20.1.8 and 21.1.2 and was fixed in those versions.

Impact Analysis

The vulnerability could allow a participant with chat permissions to delete poll drafts of other users, potentially disrupting communication or collaboration within the conversation. However, it does not impact confidentiality or availability, only integrity to a limited extent.

Mitigation Strategies

Update Nextcloud Talk to version 20.1.8 or 21.1.2 or later, as these versions contain the fix for this vulnerability.

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