Medium severity · published May 16, 2025
CVE-2025-47793
Nextcloud Server and Groupfolders app vulnerable to bypass of group folder quota limit using attachment in text file
6.5
CVSS
0.8%
EPSS
No
On KEV
Description
Nextcloud Server is a self hosted personal cloud system, and the Nextcloud Groupfolders app provides admin-configured folders shared by everyone in a group or team. In Nextcloud Server prior to 30.0.2, 29.0.9, and 28.0.1, Nextcloud Enterprise Server prior to 30.0.2 and 29.0.9, and Nextcloud Groupfolders app prior to 18.0.3, 17.0.5, and 16.0.11, the absence of quota checking on attachments allowed logged-in users to upload files exceeding the group folder quota. Nextcloud Server versions 30.0.2 and 29.0.9, Nextcloud Enterprise Server versions 30.0.2, 29.0.9, or 28.0.12, and Nextcloud Groupfolders app 18.0.3, 17.0.5, and 16.0.11 fix the issue. No known workarounds are available.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 30.0.0, < 30.0.2; >= 29.0.0, < 29.0.9; >= 28.0.0, < 28.0.12; >= 18.0.0, < 18.0.3; >= 17.0.0, < 17.0.5; >= 16.0.0, < 16.0.11 · source: vendor
GF
Group Folders · Nextcloud
16.0.0 before 16.0.11; 17.0.0 before 17.0.5; 18.0.0 before 18.0.3 · source: NVD
NS
Nextcloud Server · Nextcloud
28.0.0 before 28.0.12; 29.0.0 before 29.0.9; 29.0.0 before 29.0.9; 30.0.0 before 30.0.2; 30.0.0 before 30.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47793
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-47793
Patch
https://github.com/nextcloud/groupfolders/pull/3328
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgg-hhfq-vhww
Patch
https://github.com/nextcloud/server/pull/48623
Permissions Required
https://hackerone.com/reports/2713272
More from security-advisories
9.8
CVE-2022-31132
Unauthenticated SSRF in 3rd party module "cerdic/csstidy"
8.8
CVE-2026-45284
Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users to authenticate
8.2
CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution
8.2
CVE-2024-52519
Nextcloud Server's OAuth2 client secrets were stored in a recoverable way
8.1
CVE-2026-45281
Nextcloud: Cross-Account Calendar Takeover via Unauthorized Group-Member-Set Update