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TI-2021-16607 Aliases CVE-2021-39222

Unrestricted file upload in nextcloud security-advisories

Priority LOW 31CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Code execution, Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434 and CWE-79.

Summary

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

Why it matters now

EPSS 0.01098 65th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 10.0.7, 10.1.4, 11.1.2 +2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisoriesbefore 10.0.7; 10.1.0 to before 10.1.4; 11.1.0 to before 11.1.2; before 11.2.0; 12.0.0.alpha-1 to before 12.0.010.0.7, 10.1.4, 11.1.2, 11.2.0, 12.0.0Patch availableCNA
  • security-advisories Vendornextcloud Affected before 10.0.7; 10.1.0 to before 10.1.4; 11.1.0 to before 11.1.2; before 11.2.0; 12.0.0.alpha-1 to before 12.0.0 Fixed in 10.0.7, 10.1.4, 11.1.2, 11.2.0, 12.0.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:*before 10.0.7; 10.1.0 to before 10.1.4; 11.0.0 to before 11.1.2Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:talk:*:*:*:*:*:*:*:* Versions before 10.0.7; 10.1.0 to before 10.1.4; 11.0.0 to before 11.1.2 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 10.0.7, 10.1.4, 11.1.2, 11.2.0, 12.0.0

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39222

References

Advisory 3

  • TI-2022-08697 Open Redirect in Nextcloud Talk CVSS 3.1MEDIUM 6.1
  • TI-2021-18019 Geolocation preview links can be set to arbitrary links in nextcloud talk CVSS 3.1MEDIUM 6.1
  • TI-2023-24170 Password of talk conversations can be bruteforced in Nextcloud CVSS 3.1MEDIUM 4.3
  • TI-2022-08700 Exposure of Private Personal Information to an Unauthorized Actor in Nextcloud Talk CVSS 3.1MEDIUM 4.3
  • TI-2020-06598 Code injection in Nextcloud Talk CVSS 3.1CRITICAL 9.9
  • TI-2023-08722 Passcode bypass on Talk-Android app CVSS 3.1LOW 2.1
See all 19 →

Sources

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