CVE-2021-32766
Nextcloud Text app can disclose existence of folders in "File Drop" link share
Reported by github_m · Published September 7, 2021
Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case the public link share has been created with "Upload Only" privileges. (aka "File Drop"). A link share recipient is not expected to see which folders or files exist in a "File Drop" share. Using this vulnerability an attacker is able to enumerate folders in such a share. Exploitation requires that the attacker has access to a valid affected "File Drop" link share. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.0.1. Users who are unable to upgrade are advised to disable the Nextcloud Text application in the app settings.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| nextcloud_server | nextcloud | 22.1.0, 21.0.4, 20.0.12 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | < 20.0.12, >= 21.0.0, < 21.0.4, >= 22.0.0, < 22.0.1 |
| nextcloud | security-advisories | 0, 21.0.0, 22.0.0 |
Timeline
- Sep 6, 2021 CVE Published
- Sep 8, 2021 EPSS Score (30 in total, the first dated here)
- Aug 3, 2024 CVE Updated
- Aug 1, 2026 Coalition ESS Score
- Sep 21, 2026 Security Advisory (5 in total, the first dated here)
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