CVE-2025-66556

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.

CVSS v3.1 Score

3.5

LOW

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

Weakness Type (CWE)

CWE-639 CWE-639

Affected Products

Vendor	Product	Versions
nextcloud	talk	20.0.0 — 20.1.8
nextcloud	talk	21.0.0 — 21.1.2

References

Advisories & Patches

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

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 3.5 (LOW).

How severe is CVE-2025-66556? +

CVE-2025-66556 has a CVSS v3.1 score of 3.5 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-66556? +

CVE-2025-66556 affects products from nextcloud, specifically: talk. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66556? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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