Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue.

Published 9 y ago 2017-04-05 · modified 4 mo ago 2026-06-17 · JSON

CVSS

6.4

v3.0 · NVD

CISA KEV

not known exploited

EPSS

0.6%

percentile 49%

Public exploits

none known

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.

Exploit prediction (EPSS)

0.59% probability of exploitation in the next 30 days, higher than 49% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
NVD	3.0	6.4	`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`
NVD	2.0	5.5	`AV:N/AC:L/Au:S/C:P/I:P/A:N`

Affected products

Nextcloud Nextcloud Server

Classification

Weakness

CWE-275 Permission Issues
CWE-732 Incorrect Permission Assignment for Critical Resource

References

nextcloud.com /security/advisory/?id=nc-sa-2017-001 · x_refsource_CONFIRM, x_transferred
hackerone.com /reports/169680 · x_refsource_MISC, x_transferred

Sources

CVE List: CVE-2017-0883
NVD: CVE-2017-0883

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