CVE-2023-39962

Summary

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 19.0.0 and prior to versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a malicious user could delete any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 19.0.13.10, 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. As a workaround, disable app files_external. This also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

Affected Software

VendorProductVersion RangeStatus
nextcloudsecurity-advisories>= 19.0.0, < 19.0.13.10affected
nextcloudsecurity-advisories>= 20.0.0, < 20.0.14.15affected
nextcloudsecurity-advisories>= 21.0.0, < 21.0.9.13affected
nextcloudsecurity-advisories>= 22.0.0, < 22.2.10.14affected
nextcloudsecurity-advisories>= 23.0.0, < 23.0.12.9affected
nextcloudsecurity-advisories>= 24.0.0, < 24.0.12.5affected
nextcloudsecurity-advisories>= 25.0.0, < 25.0.9affected
nextcloudsecurity-advisories>= 26.0.0, < 26.0.4affected
nextcloudsecurity-advisories>= 27.0.0, < 27.0.1affected

Weaknesses

  • CWE-284: CWE-284: Improper Access Control

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

References