Privilege Escalation in Nextcloud Approval App (Before 2.7.2)
CVE-2026-45275 Published on June 1, 2026

Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers
Nextcloud is an open source content collaboration platform. Prior to version 2.7.2, a privilege escalation vulnerability exists in the Approval app that allows a user without sharing permissions to force the system to share a file with approvers. This results in an authorization bypass and privilege escalation, allowing unauthorized distribution of restricted files. This issue has been patched in version 2.7.2.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-45275 can be exploited with network access, and requires 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 availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

What is an AuthZ Vulnerability?

The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-45275 has been classified to as an AuthZ vulnerability or weakness.


Affected Versions

nextcloud security-advisories Version < 2.7.2 is affected by CVE-2026-45275

Exploit Probability

EPSS
0.36%
Percentile
28.40%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.