Nextcloud talk allows participants to blindly delete poll drafts of other users by ID

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-66556
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-05 18:15:58 UTC
Updated2026-10-15 21:10:00 UTC
DescriptionNextcloud 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Nextcloud Talk All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Security-advisories affected < 20.1.8 Not specified
CNA Nextcloud Security-advisories affected >= 21.0.0-beta.1, < 21.1.2 Not specified

References

ReferenceSourceLinkTags
github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725 [email protected] github.com Patch
hackerone.com/reports/3247386 [email protected] hackerone.com Issue Tracking, Vendor Advisory
github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-v... [email protected] github.com Patch, Vendor Advisory
github.com/nextcloud/spreed/pull/15532 [email protected] github.com Issue Tracking, Patch
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