CVE-2024-52509Network attack vector

Shared-file disclosure via unchecked attachment download permission

Published Nov 15, 2024 · Updated Nov 15, 2024

Improper access control in affected Nextcloud Mail versions allows remote authenticated users to read non-downloadable shared files. AttachmentService::handleCloudAttachment reads a shared file's content and creates a mail attachment without checking the share's permissions/download attribute. The user must have an account, access to a share whose owner disabled downloads, and a configured mailbox; the resulting email discloses the file contents.

CVSS severity3.5
Low
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper access control in affected Nextcloud Mail versions allows remote authenticated users to read non-downloadable shared files. AttachmentService::handleCloudAttachment reads a shared file's content and creates a mail attachment without checking the share's permissions/download attribute. The user must have an account, access to a share whose owner disabled downloads, and a configured mailbox; the resulting email discloses the file contents.

The record

CVE
CVE-2024-52509
Published
Nov 15, 2024
Updated
Nov 15, 2024
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-284, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record 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=>=2.2.0, < 2.2.10
  2. Affected versionversion=>= 3.6.0, < 3.6.2
  3. Affected versionversion=>= 3.7.0, < 3.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>=2.2.0, < 2.2.10; version=>= 3.6.0, < 3.6.2; version=>= 3.7.0, < 3.7.2

Published CVSS scores

3.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
5.7NIST NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1530Data from Cloud Storage

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo