Home/CVE/Nextcloud talk is a video & audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat pe
CVE

CVE-2025-66556

Nextcloud talk is a video & audio conferencing app for Nextcloud. Prior to 20.1.8 and 21.1.2, a participant with chat pe

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.

LOW · CVSS 3.5 EPSS 0.00013
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-639Authorization Bypass Through User-Controlled Key
▤

Affected Products & Versions

2
nextcloud talk>= 20.0.0 and < 20.1.8
nextcloud talk>= 21.0.0 and < 21.1.2
▣

Scoring & Timeline

3.5
LOW · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Dec 2025 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jhPatchVendor Advisory
https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725Patch
https://github.com/nextcloud/spreed/pull/15532Issue TrackingPatch
https://hackerone.com/reports/3247386Issue TrackingVendor Advisory
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