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CWE-749Weakness · CWE-749

CVE-2025-53827

CRITICAL · 9.1 CVSS v3.1 Published 2026-07-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
97/100
Remediation priority · Urgent
Remotely reachable Zero-click 7 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
ownCloud Core is the server-side component of the file storage, synchronization, and sharing application ownCloud Classic. In versions prior to 10.15.3, the Updater on ownCloud 10 before 10.15.3 has an exposed dangerous method or function. Attackers with administrative privileges may leverage functionality to execute arbitrary code. This issue has been fixed in version 10.15.3.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The ownCloud Core Updater component prior to version 10.15.3 contains an exposed dangerous method that allows authenticated administrators to execute arbitrary code. This stems from the Updater functionality not properly restricting access to sensitive functions that can be leveraged for remote code execution.

MitigationUpgrade ownCloud Core to version 10.15.3 or later. Additionally, restrict administrative access and monitor for suspicious updater usage until the patch is applied.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify ownCloud Core installation
    Locate the ownCloud installation directory and find the version.php or config.php file, typically in the root web directory or /var/www/owncloud. The version is usually defined in a version.php file or displayed in the ownCloud admin panel under Server Info.
    Affected if The installed version is ownCloud Core prior to 10.15.3 (for example, 10.14.x, 10.15.0, 10.15.1, or 10.15.2).
  2. Verify Updater component is present
    Check if the ownCloud Updater application is installed and enabled. This is typically found as the 'updater' app in the ownCloud apps directory (apps/updater) or can be checked in the ownCloud admin interface under Apps.
    Affected if The Updater component is installed and enabled on the ownCloud instance.
  3. Confirm administrative access exists
    Review user accounts with administrator privileges in ownCloud. This can be done through the ownCloud admin panel under Users, or by querying the oc_users or oc_group_user tables in the ownCloud database to identify users in the 'admin' group.
    Affected if There is at least one authenticated administrator account configured in ownCloud, which is required to exploit this vulnerability.

You are affected if your ownCloud Core version is prior to 10.15.3 AND the Updater component is enabled AND at least one administrator account exists in the system.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade ownCloud Core to version 10.15.3 or later. Additionally, restrict administrative access and monitor for suspicious updater usage until the patch is applied.

Recommended fix High confidence

ownCloud Core 10.15.3

  1. 1. Back up your existing ownCloud installation and database before upgrading.
  2. 2. Download ownCloud Core version 10.15.3 from the official ownCloud download page or GitHub releases.
  3. 3. Extract the new version files, replacing the existing ownCloud core files.
  4. 4. Ensure the updater component is also updated to the version bundled with 10.15.3.
  5. 5. Verify file permissions are correct after the upgrade.
  6. 6. Run the ownCloud upgrade command if required: occ upgrade
  7. 7. Clear any caches and verify the installation works correctly.
  8. 8. Confirm the Updater component no longer exposes dangerous methods by reviewing the admin panel.
Caveat Review ownCloud 10.15.3 release notes for any breaking changes to apps, themes, or configuration before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing3.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,750
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-53827 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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