HOMEVULNERABILITIESCVE-2023-35928
HIGH

CVE-2023-35928

CWE-274Published: June 23, 2023· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2.

Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.

NVD Source

Technical Analysis

CVE-2023-35928 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

nextcloud1 product(s)
nextcloud server
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5h
ADVISORYhttps://hackerone.com/reports/1978882
ADVISORYhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5h
ADVISORYhttps://hackerone.com/reports/1978882

All References (6)

→
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5hVendor Advisory
→
https://github.com/nextcloud/server/pull/38265Issue Tracking
→
https://hackerone.com/reports/1978882Third Party Advisory
→
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5hVendor Advisory
→
https://github.com/nextcloud/server/pull/38265Issue Tracking
→
https://hackerone.com/reports/1978882Third Party Advisory

Quick Facts

CVE IDCVE-2023-35928
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-274
CISA KEVNo
Affected1 vendor(s)
PublishedJun 23, 2023

Related CVEs (CWE-274)

CVE-2025-20156
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CVE-2023-39375
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CVE-2022-0668
9.8
CVE-2022-45101
9.8
CVE-2024-0105
8.9
CVE-2024-21648
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-35928 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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