Vulnerability in Nextcloud Server
CVE-2026-45282
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authenticated attacker can access attachments of link shares when knowing the share token, circumventing password protection or download restrictions. It is applicable to any file that is shared directly, as the attacker only needs to know a documentId they own, apart of the mentioned share token. For shared folders the attacker has to know or guess a documentId of a file that is included inside the folder, making it much harder to exploit. The attacker can only extract an attachments, but not the file shared file or folder itself. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17 or 27.1.11.5
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions >= 32.0.0, < 32.0.9, >= 33.0.0, < 33.0.3
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-35fx-69q6-xpjr (Mitigation, Vendor Advisory)
- github.com/nextcloud/text/pull/8499 (Patch, Issue Tracking)
- hackerone.com/reports/3577244 (Permissions Required)
Frequently asked questions
- What is CVE-2026-45282?
- CVE-2026-45282 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-06-01.
- How severe is CVE-2026-45282?
- Medium severity. CVSS v3 base score is 6.5 out of 10.