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CVE-2026-45275

Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers

Published: Jun 1, 2026Updated: Jun 1, 2026 Sources: CVE List NVD
NVD MITRE
6.5CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-285

Affected Products

security-advisories
nextcloud

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/nextcloud/approval/pull/392
github.com
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v8q8-w6c3-3gv9
github.com
https://hackerone.com/reports/3593780
hackerone.com

Timeline

Published
Jun 1, 2026
Last Updated
Jun 1, 2026

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