CVE-2022-41970Network attack vector

File disclosure via unchecked preview share attributes

Published Dec 1, 2022 · Updated Apr 23, 2025

Improper access control in Nextcloud Server before 24.0.7 and version 25.0.0 allows remote authenticated users to retrieve restricted previews. The PublicPreviewController and PreviewController endpoints generated previews without checking the share permissions/download attribute. Access to a share with downloads disabled is required; images remain downloadable, while document previews disclose the first page without a watermark.

CVSS severity2.6
Low
EPSS probability0.63%
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 before 24.0.7 and version 25.0.0 allows remote authenticated users to retrieve restricted previews. The PublicPreviewController and PreviewController endpoints generated previews without checking the share permissions/download attribute. Access to a share with downloads disabled is required; images remain downloadable, while document previews disclose the first page without a watermark.

The record

CVE
CVE-2022-41970
Published
Dec 1, 2022
Updated
Apr 23, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-284, CWE-863, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 24.0.7
  2. Affected versionversion=>= 25.0.0, < 25.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 24.0.7; version=>= 25.0.0, < 25.0.1

Published CVSS scores

2.6GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
5.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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 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
CWE-863Incorrect Authorization
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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