Auth bypass in Nextcloud Richdocuments
CVE-2021-37628
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.021 (80.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- Nextcloud Richdocuments
- Nextcloud Security-Advisories — versions < 3.8.4, >= 4.0.0, < 4.2.1
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w (Third Party Advisory)
- github.com/nextcloud/richdocuments/pull/1664 (Patch, Third Party Advisory)
- hackerone.com/reports/1253403 (Permissions Required, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-37628?
- CVE-2021-37628 is a high-severity vulnerability in Nextcloud Richdocuments, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2021-09-07.
- How severe is CVE-2021-37628?
- High severity. CVSS v3 base score is 7.5 out of 10.