OwncloudApplication
CVE-2021-35949
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 · uneditedThe shareinfo controller in the ownCloud Server before 10.8.0 allows an attacker to bypass the permission checks for upload only shares and list metadata about the share.
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 confidenceThe shareinfo controller in ownCloud Server before 10.8.0 fails to properly enforce permission checks on upload-only shares, allowing unauthenticated or unauthorized users to bypass access controls and retrieve metadata about shares they should not have access to.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
OwncloudApplication
< 10.8.0CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify ownCloud Server versionCheck the installed ownCloud Server version through the admin interface (Settings > General) or by examining version files in the ownCloud installation directory. Compare the version number against the affected range (any version before 10.8.0).Affected if Installed version is below 10.8.0
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Verify shareinfo endpoint existsLocate and confirm the presence of the shareinfo controller endpoint in the ownCloud installation. This is typically found in the OCS (OwnCloud Sharing) API routes related to share information retrieval.Affected if shareinfo controller endpoint is present and accessible
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Confirm upload-only shares existReview existing share configurations in ownCloud to identify any shares created with upload-only permissions (allow upload but not download/access to files). Check share settings where 'upload only' permission is granted.Affected if Any upload-only share configurations exist in the system
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Test unauthenticated share metadata accessAttempt to access share metadata through the shareinfo endpoint using a share token without valid authentication or proper authorization credentials. Observe whether metadata (such as share owner, permissions, or file details) is returned without access validation.Affected if Unauthenticated or unauthorized requests to shareinfo endpoint return share metadata that should be protected
A user is affected if running ownCloud Server version below 10.8.0 with upload-only shares accessible via the shareinfo endpoint to unauthorized requestors.
Generated from the published advisory. Verify against your own configuration.
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 · scoped10.8.0
Upgrade ownCloud Server to version 10.8.0 or later to obtain the patched shareinfo controller that properly enforces permission checks on all share types.
ownCloud Server 10.8.0
- Backup the current ownCloud Server installation and database
- Download ownCloud Server 10.8.0 from the official ownCloud website
- Follow the official ownCloud upgrade documentation for your installation method
- Execute the upgrade process
- Verify the shareinfo controller now properly enforces permission checks for upload-only shares
- Confirm all functionality is working as expected after upgrade
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Owncloud
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-35949 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-35949 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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