Information disclosure in Nextcloud Officeonline
CVE-2021-39224
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 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 OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.
Vulnerability class: Information Disclosure
EPSS: 0.008 (54.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
Affected products
- Nextcloud Officeonline
- Nextcloud Security-advisories — versions < 1.1.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-39224?
- CVE-2021-39224 is a low-severity vulnerability in Nextcloud Officeonline, classified under Information Disclosure. CVSS score: 3.5/10. Published 2021-10-25.
- How severe is CVE-2021-39224?
- Low severity. CVSS v3 base score is 3.5 out of 10.