CVE-2023-35928

Summary

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2.

Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings …/index.php/settings/admin/externalstorages. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings …/index.php/settings/admin/externalstorages with the types FTP, Nextcloud, SFTP, and/or WebDAV.

Affected Software

VendorProductVersion RangeStatus
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 19.0.0, < 19.0.13.9affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 20.0.0.0, < 20.0.14.14affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 21.0.0.0, < 21.0.9.12affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 22.0.0.0, < 22.2.10.12affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 23.0.0.0, < 23.0.12.7affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 24.0.0.0, < 24.0.12.2affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 25.0.0, < 25.0.7affected
nextcloudsecurity-advisoriesNextcloud Enterprise Server >= 26.0.0, < 26.0.2affected
nextcloudsecurity-advisoriesNextcloud Server >= 25.0.0, < 25.0.7affected
nextcloudsecurity-advisoriesNextcloud Server >= 26.0.0, < 26.0.2affected

Weaknesses

  • CWE-274: CWE-274: Improper Handling of Insufficient Privileges

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References