CVE-2025-47793Network attack vector

Authenticated quota bypass via non-overridable quota check

Published May 16, 2025 · Updated May 16, 2025

Quota enforcement in Nextcloud Server, Enterprise Server, and Groupfolders releases allows remote authenticated users to exceed folder limits. The Groupfolders storage wrapper inherits Server's Quota class, whose non-overridable shouldApplyQuota check prevents the wrapper from applying its group-folder quota to text-file attachments. Any logged-in user who can add an attachment to a text file in a quota-limited group folder can store data beyond the administrator-set quota.

CVSS severity4.3
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Quota enforcement in Nextcloud Server, Enterprise Server, and Groupfolders releases allows remote authenticated users to exceed folder limits. The Groupfolders storage wrapper inherits Server's Quota class, whose non-overridable shouldApplyQuota check prevents the wrapper from applying its group-folder quota to text-file attachments. Any logged-in user who can add an attachment to a text file in a quota-limited group folder can store data beyond the administrator-set quota.

The record

CVE
CVE-2025-47793
Published
May 16, 2025
Updated
May 16, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-770
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 16.0.0, < 16.0.11
  2. Affected versionversion=>= 17.0.0, < 17.0.5
  3. Affected versionversion=>= 18.0.0, < 18.0.3
  4. Affected versionversion=>= 28.0.0, < 28.0.12
  5. Affected versionversion=>= 29.0.0, < 29.0.9
  6. Affected versionversion=>= 30.0.0, < 30.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 16.0.0, < 16.0.11; version=>= 17.0.0, < 17.0.5; version=>= 18.0.0, < 18.0.3; version=>= 28.0.0, < 28.0.12; version=>= 29.0.0, < 29.0.9; version=>= 30.0.0, < 30.0.2

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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