CVE-2023-28643

Potential share collision for recipients when caching is enabled in nextcloud server

HIGH
8.8
CVSS Score
Published: March 30, 2023 at 06:31 PM UTC
Updated: June 17, 2026 at 05:48 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9. Users unable to upgrade should avoid sharing 2 folders with the same name to the same user.

Affected

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

24.0.0 ≤ v < 24.0.925.0.0 ≤ v < 25.0.3
Affected range stops below 24.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.3, 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

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
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-706

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