CVE-2026-45159 Details
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.
A vulnerability exists in Nextcloud's End-to-End Encryption feature, specifically in versions 1.15.0 prior to 1.15.4, 1.16.0 prior to 1.16.3, 1.17.0 prior to 1.17.1, and 1.18.0 prior to 1.18.1. This issue allows a malicious user with access to an encrypted files drop link to inadvertently drop files into other encrypted folders belonging to the share owner. However, this vulnerability does not permit reading or modifying of other files.
Users are advised to update the Nextcloud End-to-End Encryption app to version 1.15.4, 1.16.3, 1.17.1, 1.18.1, or 2.0.0-rc.7.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 1, 2026CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nextcloud/end_to_end_encryption/pull/1395 | [email protected] | Source CodeVendor |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p3qw-7gwx-wg24 | [email protected] | AdvisoryRemedyVendor |
| https://hackerone.com/reports/3304830 | [email protected] | Issue TrackingTechnical Description |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Nextcloud | >= 1.15.0, < 1.15.4 (semver) >= 1.16.0, < 1.16.3 (semver) >= 1.17.0, < 1.17.1 (semver) >= 1.18.0, < 1.18.1 (semver) |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | New CVE Received | [email protected] |