CVE-2023-25821Public exploitNetwork attack vector

Secure-view disclosure via lost reshare attributes

Published Feb 24, 2023 · Updated Mar 10, 2025

Improper access control in Nextcloud Server 24.0.4 through 24.0.6 and 25.0.0 allows remote authenticated users to download secure-view files. ShareAPIController loads a reshared node from the owner rather than the share initiator, so restrictive share attributes are not propagated. The gate is an existing reshare permission and interaction with the resulting share; the consequence is unauthorized retrieval of protected file contents.

CVSS severity5.7
Medium
EPSS probability0.95%
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 24.0.6 and 25.0.0 allows remote authenticated users to download secure-view files. ShareAPIController loads a reshared node from the owner rather than the share initiator, so restrictive share attributes are not propagated. The gate is an existing reshare permission and interaction with the resulting share; the consequence is unauthorized retrieval of protected file contents.

The record

CVE
CVE-2023-25821
Published
Feb 24, 2023
Updated
Mar 10, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-284, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 24.0.4, < 24.0.7
  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=>= 24.0.4, < 24.0.7; version=>= 25.0.0, < 25.0.1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.7GitHub, Inc.CVSS: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 exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1530Data from Cloud Storage

Public exploit references

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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