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Fencer Vulns
medium 5.3

CVE-2021-32766 json

Nextcloud Text app can disclose existence of folders in "File Drop" link share

published 2021-09-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19534

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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.

Patch / fix

  • nextcloud nextcloud_server 20.0.12, 21.0.4, 22.1.0
  • nextcloud Package Hub 15 SP2 20.0.12-bp152.2.12.1
  • nextcloud Package Hub 15 SP3, openSUSE Leap 15.3 20.0.12-bp153.2.6.1
  • nextcloud openSUSE Leap 15.2 20.0.12-lp152.3.12.1
  • nextcloud Package Hub 12 20.0.12-31.1
  • nextcloud Package Hub 15 SP1 20.0.12-bp151.3.18.1

opensuse advisories openSUSE-SU-2021:1275-1openSUSE-SU-2021:1255-1openSUSE-SU-2021:1253-1openSUSE-SU-2021:1252-1openSUSE-SU-2021:1250-1

Exploit prediction

1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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-209 Generation of Error Message Containing Sensitive Information

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.