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OwncloudApplication

CVE-2021-35948

MEDIUM · 5.4 CVSS v3.1 Published 2021-09-07
Fix available
A fix is available. Upgrade to 10.8.0 or later.
See remediation →
61/100
Remediation priority · Elevated
Remotely reachable No privileges

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
Session fixation on password protected public links in the ownCloud Server before 10.8.0 allows an attacker to bypass the password protection when they can force a target client to use a controlled cookie.

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

A session fixation vulnerability in ownCloud Server versions before 10.8.0 allows attackers to bypass password protection on public links by forcing a target client to use a controlled session cookie. The attacker can set or manipulate the session cookie before the victim accesses the password-protected link, then use that same session to gain unauthorized access after the victim enters the password.

MitigationUpgrade ownCloud Server to version 10.8.0 or later, which contains the fix for proper session handling on password-protected public links. Verify that session cookies are regenerated after password authentication.

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
Affected:< 10.8.0

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

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

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

  1. Identify ownCloud Server version
    Locate the ownCloud Server version number in the admin interface under Settings > General or in the version.php file in the installation directory
    Affected if The installed version is any version prior to 10.8.0 (e.g., 10.7.0, 10.6.0, etc.)
  2. Confirm public link sharing is enabled
    Check if public link sharing is activated in the ownCloud admin settings under Sharing
    Affected if Public link sharing is enabled and accessible to users
  3. Verify password protection on public links is in use
    Review existing public links in the ownCloud interface to identify any that have password protection configured
    Affected if There are password-protected public links in use
  4. Check session cookie behavior after password entry
    Attempt to access a password-protected public link while monitoring session cookies (e.g., via browser developer tools) - observe whether the session ID changes after entering the password
    Affected if The session cookie value remains identical before and after password authentication (session is NOT regenerated)

You are affected if your ownCloud Server version is below 10.8.0 and you have password-protected public links where the session cookie is not regenerated after password entry.

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
Upgrade available Upgrade to 10.8.0 or later
Fixed in 10.8.0
Interim mitigation

Upgrade ownCloud Server to version 10.8.0 or later, which contains the fix for proper session handling on password-protected public links. Verify that session cookies are regenerated after password authentication.

Recommended fix Moderate confidence

ownCloud Server 10.8.0

  1. 1. Back up your current ownCloud installation and database.
  2. 2. Download ownCloud Server version 10.8.0 or later from the official ownCloud download page.
  3. 3. Extract the new files to replace your existing ownCloud installation.
  4. 4. Run the ownCloud upgrade command or access the server to trigger the migration process.
  5. 5. Verify that the upgrade completed successfully by logging into the admin panel.
  6. 6. Confirm the version number shows 10.8.0 or later.

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

Fix this in Owncloud Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

Scan for this in your stack

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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-2021-35948 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