CVE-2023-28847

Nextcloud Server missing brute force protection for passwords of password protected share links

HIGH
7.5
CVSS Score
Published: April 25, 2023 at 04:32 PM UTC
Updated: June 17, 2026 at 05:48 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
HIGH7.5
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. In Nextcloud Server 24.0.0 prior to 24.0.11 and 25.0.0 prior to 25.0.5; as well as Nextcloud Server Enterprise 23.0.0 prior to 23.0.12.6, 24.0.0 prior to 24.0.11, and 25.0.0 prior to 25.0.5; an attacker is not restricted in verifying passwords of share links so they can just start brute forcing the password. Nextcloud Server 24.0.11 and 25.0.5 and Nextcloud Enterprise Server 23.0.12.6, 24.0.11, and 25.0.5 contain a fix for this issue. No known workarounds are available.

Affected

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

23.0.0 ≤ v < 23.0.12.624.0.0 ≤ v < 24.0.1125.0.0 ≤ v < 25.0.5
Affected range stops below 23.0.12.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.5, 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:

References (3)

x_refsource_MISCIssue TrackingPatch
https://github.com/nextcloud/server/pull/35057
x_refsource_MISCExploitIssue TrackingThird Party Advisory
https://hackerone.com/reports/1894653

SSVC — Action Prioritization

SSVCNo known exploitNot 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-307

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