CVE-2026-45159
June 1, 2026, 6:14 p.m.
3.5
Low
Description
Nextcloud is an open source content collaboration platform. From versions 1.15.0 to before 1.15.4, 1.16.0 to before 1.16.3, 1.17.0 to before 1.17.1, and 1.18.0 to before 1.18.1, a malicious user with access to an end-to-end encrypted files drop link was able to also drop files into other end-to-end encrypted folders of the share owner. Reading and modifying of other files was not possible. This issue has been patched in versions 1.15.4, 1.16.3, 1.17.1, 1.18.1, and 2.0.0-rc.7.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-639
Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | nextcloud | nextcloud | 1.15.0-1.15.4 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud | 1.16.0-1.16.3 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud | 1.17.0-1.17.1 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud | 1.18.0-1.18.1 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud | 2.0.0-rc.7 | / | / | / | / | / | / | / |
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: LOW
- Scope: UNCHANGED
- Confidentiality Impact: NONE
- Integrity Impact: LOW
- Availability Impact: NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Timeline
Published: June 1, 2026, 5:17 p.m.
Last Modified: June 1, 2026, 6:14 p.m.
Last Modified: June 1, 2026, 6:14 p.m.
Status : Deferred
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.