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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Nextcloud Officeonline
- Nextcloud Security-Advisories — versions < 1.1.1
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-56wm-r6jm-3v9h (Third Party Advisory)
- github.com/nextcloud/officeonline/pull/204 (Patch, Third Party Advisory)
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.