TI-2021-18072 Aliases CVE-2021-41233

Missing authorization in Nextcloud text

LOW 36CWE-862Published 2022-03-10 · Updated 2025-04-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Nextcloud text is a collaborative document editing using Markdown built for the nextcloud server. Due to an issue with the Nextcloud Text application, which is by default shipped with Nextcloud Server, an attacker is able to access the folder names of "File Drop". For successful exploitation an attacker requires knowledge of the sharing link. It is recommended that users upgrade their Nextcloud Server to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the Nextcloud Text application in the application settings.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00788 56th percentileScored 2026-11-07

Fix Fixed security-advisories (nextcloud): 20.0.14, 21.0.6, 22.2.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nextcloud	security-advisories	before 20.0.14; 21.0.0 to before 21.0.6; 22.0.0 to before 22.2.1	20.0.14, 21.0.6, 22.2.1	Patch available	CNA

security-advisories Vendornextcloud Affected before 20.0.14; 21.0.0 to before 21.0.6; 22.0.0 to before 22.2.1 Fixed in 20.0.14, 21.0.6, 22.2.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nextcloud:nextcloud_server::::::::	before 20.0.14; 21.0.0 to before 21.0.6; 22.2.0 to before 22.2.1	Vulnerable	nextcloud

cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 20.0.14; 21.0.0 to before 21.0.6; 22.2.0 to before 22.2.1 Vulnerable ·nextcloud

Remediation

Fix · CNA security-advisories (nextcloud) Fixed in 20.0.14, 21.0.6, 22.2.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2021-41233

References

Patch 1

https://github.com/nextcloud/text/pull/1884

Advisory 1

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-26c8-35cm-xq9m

TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
TI-2023-11091 Nextcloud download permissions can be changed by resharer CVSS 3.1HIGH 7.5
TI-2023-10624 Nextcloud Server vulnerable to SSRF via filter bypass due to lax checking on IPs CVSS 3.1MEDIUM 5.3
TI-2025-37238 Cross-site scripting in Nextcloud CVSS 3.1MEDIUM 6.4
TI-2023-11086 nextcloud vulnerable to Uncontrolled Resource Consumption CVSS 3.1MEDIUM 6.5
TI-2022-18738 Exception logging in Sharepoint app reveals clear-text connection details CVSS 3.1MEDIUM 6.5

See all 188 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences