CVE-2025-66556

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

CVSS 3.5 LOWEPSS 0.2%CWE-639

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.5EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

05 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

nextcloud · security-advisories

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References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pr9f-vqgg-m2jh https://github.com/nextcloud/spreed/commit/bd68e80d1dea98d84c1d621c2c681238cf041725 https://github.com/nextcloud/spreed/pull/15532 https://hackerone.com/reports/3247386