High severity · published Sep 7, 2021
CVE-2021-37628
Nextcloud Richdocuments is an open source collaborative office suite
7.5
CVSS
2.1%
EPSS
No
On KEV
Description
Nextcloud Richdocuments is an open source collaborative office suite. In affected versions the File Drop features ("Upload Only" public link shares in Nextcloud) can be bypassed using the Nextcloud Richdocuments app. An attacker was able to read arbitrary files in such a share. It is recommended that the Nextcloud Richdocuments is upgraded to 3.8.4 or 4.2.1. If upgrading is not possible then it is recommended to disable the Richdocuments application.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RI
Richdocuments · Nextcloud
before 3.8.4; 4.0.0 before 4.2.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-37628
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-37628
Patch
https://github.com/nextcloud/richdocuments/pull/1664
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w
Permissions Required
https://hackerone.com/reports/1253403
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