Medium severity · published Oct 25, 2021
CVE-2021-39223
Nextcloud is an open-source, self-hosted productivity platform
5.3
CVSS
1.1%
EPSS
No
On KEV
Description
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RI
Richdocuments · Nextcloud
before 3.8.6; 4.0.0 before 4.2.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-39223
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-39223
Patch
https://github.com/nextcloud/richdocuments/pull/1760
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-rjcc-4cgj-6v93
Permissions Required
https://hackerone.com/reports/1253460
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