CVE-2023-28844Network attack vector

Protected file disclosure via unchecked versions endpoint

Published Mar 31, 2023 · Updated Feb 11, 2025

Improper access control in Nextcloud Server 24.0.4 through 24.0.9 and 25.0.0 through 25.0.3 allows remote authenticated users to read protected file versions. The ViewOnly DAV plugin treats VersionFile nodes as unrestricted because it applies download-permission checks only to ordinary DAV files. A user with access to a view-only share and its versions endpoint can retrieve an older revision even when the share disables downloads, exposing historical content for uncontrolled distribution.

CVSS severity5.7
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Nextcloud Server 24.0.4 through 24.0.9 and 25.0.0 through 25.0.3 allows remote authenticated users to read protected file versions. The ViewOnly DAV plugin treats VersionFile nodes as unrestricted because it applies download-permission checks only to ordinary DAV files. A user with access to a view-only share and its versions endpoint can retrieve an older revision even when the share disables downloads, exposing historical content for uncontrolled distribution.

The record

CVE
CVE-2023-28844
Published
Mar 31, 2023
Updated
Feb 11, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-284, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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=< 24.0.10
  2. Affected versionversion=>= 25.0.0, < 25.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 24.0.10; version=>= 25.0.0, < 25.0.4

Published CVSS scores

5.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/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-284Improper Access Control
T1530Data from Cloud Storage

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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