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CVE Vulnerability Details :
CVE-2025-66556
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-05 Dec, 2025 | 17:56
Updated At-05 Dec, 2025 | 18:09
Rejected At-
▼CVE Numbering Authority (CNA)
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.

Affected Products
Vendor
Nextcloud GmbHnextcloud
Product
security-advisories
Versions
Affected
  • < 20.1.8
  • >= 21.0.0-beta.1, < 21.1.2
Problem Types
TypeCWE IDDescription
CWECWE-639CWE-639: Authorization Bypass Through User-Controlled Key
Type: CWE
CWE ID: CWE-639
Description: CWE-639: Authorization Bypass Through User-Controlled Key
Metrics
VersionBase scoreBase severityVector
3.13.5LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Version: 3.1
Base score: 3.5
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh
x_refsource_CONFIRM
https://github.com/nextcloud/spreed/pull/15532
x_refsource_MISC
https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725
x_refsource_MISC
https://hackerone.com/reports/3247386
x_refsource_MISC
Hyperlink: https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/nextcloud/spreed/pull/15532
Resource:
x_refsource_MISC
Hyperlink: https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725
Resource:
x_refsource_MISC
Hyperlink: https://hackerone.com/reports/3247386
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found