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Nextcloud ServerApplication · Nextcloud

CVE-2024-37884

MEDIUM · 5.4 CVSS v3.1 Published 2024-06-14
Fix available
A fix is available. Upgrade to 25.0.13.7 / 26.0.13 or later.
See remediation →
60/100
Remediation priority · Elevated
Remotely reachable Zero-click Patch available

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
Nextcloud Server is a self hosted personal cloud system. A malicious user was able to send delete requests for old versions of files they only got shared with read permissions. It is recommended that the Nextcloud Server is upgraded to 26.0.12 or 27.1.7 or 28.0.3 and that the Nextcloud Enterprise Server is upgraded to 26.0.12 or 27.1.7 or 28.0.3.

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
How this class of weakness works · CWE-284

The application fails to correctly restrict what a user can do or reach, so functions or resources are available to people who should not have them. Attackers simply probe for the paths where the check is missing or wrong. The fix is to enforce access-control decisions consistently on every request, evaluated against the acting user rather than assumed from context.

General guidance for the improper access control class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Nextcloud ServerApplication
Affected:>= 25.0.0, < 25.0.13.7>= 26.0.0, < 26.0.13>= 27.0.0, < 27.1.8>= 28.0.0, < 28.0.4

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

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

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
Upgrade available Upgrade to 25.0.13.7 / 26.0.13 / 27.1.8 or later
Fixed in 25.0.13.726.0.1327.1.8
Vendor patch github.com →
Recommended fix High confidence

Nextcloud Server 25.0.13.7+, 26.0.13+, 27.1.8+, or 28.0.4+ (depending on your current major version)

  1. 1. Back up your Nextcloud data directory and database before proceeding with any upgrade.
  2. 2. Identify your current Nextcloud Server version from the admin settings page.
  3. 3. For Nextcloud Server 25.x: Upgrade to version 25.0.13.7 or later.
  4. 4. For Nextcloud Server 26.x: Upgrade to version 26.0.13 or later.
  5. 5. For Nextcloud Server 27.x: Upgrade to version 27.1.8 or later.
  6. 6. For Nextcloud Server 28.x: Upgrade to version 28.0.4 or later.
  7. 7. After upgrading, verify the version in the admin settings to confirm the patch was applied.
  8. 8. Test that file sharing with read-only permissions now properly prevents version deletion.
Caveat Minor version upgrades typically have minimal breaking changes; review the Nextcloud changelog for your target version for any deprecation notices

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

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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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-2024-37884 in production — separate from our analysis above.

No notes yet

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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
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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