CVE-2021-32766

Name: CVE-2021-32766
Creator: NVD / NIST
Published: 2021-09-07T21:15:08.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2021-32766 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.30%

66.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 20.0.12
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.4
Nextcloud	Nextcloud Server	>= 22.0.0, < 22.1.0

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3wmc-88jrThird Party Advisory
https://github.com/nextcloud/text/pull/1716Patch, Third Party Advisory
https://hackerone.com/reports/1253475Permissions Required, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gcf3-3wmc-88jrThird Party Advisory
https://github.com/nextcloud/text/pull/1716Patch, Third Party Advisory
https://hackerone.com/reports/1253475Permissions Required, Third Party Advisory

Timeline

Published: Sep 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32766?

How severe is CVE-2021-32766?

CVE-2021-32766 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32766?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32766?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST