CVE-2023-28647

Protected-file disclosure via unguarded Files integration

Published Mar 30, 2023 · Updated Feb 11, 2025

Authentication bypass in Nextcloud iOS before 4.7.0 allows physically proximate attackers to read protected files through iOS Files. Before the patch, the File Provider extension did not enforce configured passcode protection when iOS Files enumerated account content. Exploitation requires physical access to an unlocked device and the ability to enable the integration; the bounded consequence is unauthorized file access.

CVSS severity4.4
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Nextcloud iOS before 4.7.0 allows physically proximate attackers to read protected files through iOS Files. Before the patch, the File Provider extension did not enforce configured passcode protection when iOS Files enumerated account content. Exploitation requires physical access to an unlocked device and the ability to enable the integration; the bounded consequence is unauthorized file access.

The record

CVE
CVE-2023-28647
Published
Mar 30, 2023
Updated
Feb 11, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-287, CWE-281, T1005
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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=< 4.7.0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 4.7.0

Published CVSS scores

4.4GitHub CNACVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-281Improper Preservation of Permissions
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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