CVE-2021-32766: nextcloud nextcloud_server
Vulnerability summary
CVE-2021-32766 is a medium (CVSS 5.3) vulnerability in nextcloud nextcloud_server. EPSS estimates a 1.34% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 07-09-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
1.34%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
0.00 pp
From 1.34% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Nextcloud2 products
- nextcloud_server< 20.0.12 | ≥ 21.0.0, < 21.0.4 | ≥ 22.0.0, < 22.1.0
- security-advisories< 20.0.12 | ≥ 21.0.0, < 21.0.4 | ≥ 22.0.0, < 22.0.1
1 vendor · 2 products
References
3 links- github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3wmc-88jrX Refsource CONFIRMThird Party Advisory