CVE-2021-37628 json
File Drop can be bypassed using Richdocuments app in nextcloud
published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24184
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
2.09% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-639 Authorization Bypass Through User-Controlled Key
References
-
github.com
/nextcloud/richdocuments/pull/1664
patch, third-party-advisory
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w
third-party-advisory
-
hackerone.com
/reports/1253403
permissions-required, third-party-advisory
Sources
- CVE List CVE-2021-37628
- NVD CVE-2021-37628
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