Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue
Published Apr 5, 2017
6.4
MEDIUMCVSS 3.0
EPSS 0.59%
Description
Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue. A permission related issue within the OCS sharing API allowed an authenticated adversary to reshare shared files with an increasing permission set. This may allow an attacker to edit files in a share despite having only a 'read' permission set. Note that this only affects folders and files that the adversary has at least read-only permissions for.
Affected products
-
- Version All versions before 9.0.55 and 10.0.2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Nextcloud | Nextcloud Server | n/a |
|
- ≤ 9.0.54
- 10.0.2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
AV:N/AC:L/Au:S/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.59% (0.00593) | 46.36th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.59% (0.00593) | 47.00th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.05% (0.00054) | 22.17th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.05% (0.00054) | 21.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00054) | 19.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (2)
- https://hackerone.com/reports/169680 x_refsource_MISCThird Party Advisory
- https://nextcloud.com/security/advisory/?id=nc-sa-2017-001 x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://hackerone.com/reports/169680 | x_refsource_MISCThird Party Advisory | |
| https://nextcloud.com/security/advisory/?id=nc-sa-2017-001 | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.