CVE-2023-25821

Nextcloud download permissions can be changed by resharer

HIGH
7.5
CVSS Score
Published: February 24, 2023 at 11:39 PM UTC
Updated: June 17, 2026 at 05:42 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
SSVC
PoC

Description

Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is patched in versions 24.0.7 and 25.0.1. No workaround is available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

24.0.4 ≤ v < 24.0.725.0.0
Affected range stops below 24.0.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-Other

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