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Nextcloud ServerApplication · Nextcloud

CVE-2024-37882

HIGH · 8.1 CVSS v3.1 Published 2024-06-14
Fix available
A fix is available. Upgrade to 23.0.12.17 / 24.0.12.13 or later.
See remediation →
87/100
Remediation priority · High
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 recipient of a share with read&share permissions could reshare the item with more permissions. It is recommended that the Nextcloud Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4 and that the Nextcloud Enterprise Server is upgraded to 26.0.13 or 27.1.8 or 28.0.4.

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:>= 26.0.0, < 26.0.13>= 27.0.0, < 27.1.8>= 28.0.0, < 28.0.4>= 23.0.0, < 23.0.12.17>= 24.0.0, < 24.0.12.13>= 25.0.0, < 25.0.13.8

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
High
Integrity
High
Availability
None

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

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 23.0.12.17 / 24.0.12.13 / 25.0.13.8 or later
Fixed in 23.0.12.1724.0.12.1325.0.13.8
Vendor patch github.com →
Recommended fix High confidence

Upgrade to Nextcloud Server 26.0.13, 27.1.8, or 28.0.4 (choose the major version matching your current installation)

  1. 1. Create a complete backup of the Nextcloud database and data directory before proceeding
  2. 2. Enable maintenance mode: occ maintenance:mode --on
  3. 3. For package-based installations (e.g., Debian/Ubuntu with apt): Update the package list and upgrade: sudo apt update && sudo apt install nextcloud-server (or specific version)
  4. 4. For manual installations: Download the appropriate version (26.0.13, 27.1.8, or 28.0.4) from nextcloud.com/install
  5. 5. Extract the new files, overwriting the existing installation while preserving config.php and data directory
  6. 6. Run the Nextcloud upgrade command: occ upgrade
  7. 7. Clear cached data: occ files:scan --all
  8. 8. Disable maintenance mode: occ maintenance:mode --off
Caveat Minor version upgrades typically have minimal breaking changes; review the Nextcloud changelog for the target version to check for any deprecated features or required database migrations

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 $1,950. 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-2024-37882 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
  • No spam, self-promotion, credentials, or personal data