CVE-2026-45157: Nextcloud Security-Advisories

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a malicious user has access to a file share of a user, they could use this share token to also access the chunking upload directly and see temporary part files during on going uploads. It is recommended that the Nextcloud Server is upgraded to 32.0.9 or 33.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 26.0.13.26, 27.1.11.25, 28.0.14.17, 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9 or 33.0.3

Affected products

• Nextcloud Security-Advisories: from 32.0.0, before 32.0.9 (fixed in 32.0.9); from 33.0.0, before 33.0.3 (fixed in 33.0.3)

Published 2026-06-01. Last modified 2026-07-22.