CVE-2023-25159

Unwatermarked preview disclosure via unchecked share permissions

Published Feb 13, 2023 · Updated Mar 10, 2025

Improper access control in Nextcloud Server and Enterprise Server allows attackers to view unwatermarked previews through hide-download shares. In Server 24.0.4 through 24.0.7 and 25.0.0 with Nextcloud Office 6.0.0 through 6.3.0 or 7.0.0, the preview path fails to consult node and share permissions. Possession of an affected share link is required; document content appears without the configured watermark, but the flaw does not permit file modification.

CVSS severity2.3
Low
EPSS probability0.46%
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 and Enterprise Server allows attackers to view unwatermarked previews through hide-download shares. In Server 24.0.4 through 24.0.7 and 25.0.0 with Nextcloud Office 6.0.0 through 6.3.0 or 7.0.0, the preview path fails to consult node and share permissions. Possession of an affected share link is required; document content appears without the configured watermark, but the flaw does not permit file modification.

The record

CVE
CVE-2023-25159
Published
Feb 13, 2023
Updated
Mar 10, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-284, T1213, T1190
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=>= 24.0.4, < 24.0.8
  2. Affected versionversion== 25.0.0
  3. Affected versionversion=>= 6.0.0, < 6.3.1
  4. Affected versionversion== 7.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 24.0.4, < 24.0.8; version== 25.0.0; version=>= 6.0.0, < 6.3.1; version== 7.0.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
2.3GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1213Data from Information Repositories
T1190Exploit Public-Facing Application

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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