Medium severity · published Jun 1, 2026
CVE-2026-45275
Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
< 2.7.2 · source: vendor
AP
Approval · Nextcloud
before 2.7.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45275
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45275
Issue Tracking
https://github.com/nextcloud/approval/pull/392
Mitigation
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v8q8-w6c3-3gv9
Permissions Required
https://hackerone.com/reports/3593780
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