CVE-2019-15624Public exploitNetwork attack vector

System-folder account creation via unchecked user IDs

Published Feb 4, 2020 · Updated Aug 5, 2024

Improper input validation in Nextcloud Server 15.0.7 allows remote authenticated users with group-admin rights to create system-folder IDs. The user-creation path accepts a supplied account ID without rejecting values reserved for server-managed folders, causing the account path to collide with a system directory. Group-admin access is required, and Nextcloud has not published which data or service operations become possible after the collision.

CVSS severity8.4
High
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Nextcloud Server 15.0.7 allows remote authenticated users with group-admin rights to create system-folder IDs. The user-creation path accepts a supplied account ID without rejecting values reserved for server-managed folders, causing the account path to collide with a system directory. Group-admin access is required, and Nextcloud has not published which data or service operations become possible after the collision.

The record

CVE
CVE-2019-15624
Published
Feb 4, 2020
Updated
Aug 5, 2024
Vendor
Nextcloud GmbH
Product
Nextcloud Server
Classifications
CWE-20, T1136
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record 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=15.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Nextcloud Serverversion=15.0.7

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N
8.4NextcloudCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1136Create Account

Public exploit references

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Technologies

Your stack

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Your stack

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