Nextcloud Share Token Abuse: Chunks Visible (32.0.032.0.9/33.0.033.0.3)
CVE-2026-45157 Published on June 1, 2026
Nextcloud: Valid share tokens allow to access tempory upload files of share owner
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
Vulnerability Analysis
CVE-2026-45157 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2026-45157 has been classified to as an Authorization vulnerability or weakness.
Affected Versions
nextcloud security-advisories:- Version >= 32.0.0, < 32.0.9 is affected.
- Version >= 33.0.0, < 33.0.3 is affected.