Vulnerability · Published Oct 25, 2021 · Assigned by GitHub_M

CVE-2021-39225Missing permission check on Deck API

High 8.1

In plain English

A high-severity authorization bypass via user-controlled key in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)1.3%top 28.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 1.2.9>= 1.4.0, < 1.4.5>= 1.5.0, < 1.5.3

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

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