Security readout for executives and security teams
Plain-English summary
CVE-2021-35948 affects ownCloud Server versions before 10.8.0. A password protected public link could be accessed without knowing the password if an attacker can make a target client use an attacker-controlled cookie. This mainly threatens shared files exposed through public links.
Executive priority
Prioritize remediation for internet-accessible ownCloud systems or environments sharing sensitive documents through public links. The available evidence does not show active exploitation, but the control bypass can undermine intended data-sharing restrictions.
Technical view
The issue is described as session fixation in password protected public links. The required condition is attacker control over the client cookie used by the target. The source bundle does not provide CVSS, CWE, affected CPEs, or detailed exploit mechanics.
Likely exposure
Organizations running ownCloud Server before 10.8.0 with password protected public links may be exposed. Exposure depends on whether attackers can influence client cookies and whether sensitive data is shared through public links.
Exploitation context
CISA KEV is false in the source bundle, and no cited source states active exploitation. The vulnerability is conditional because the attacker must force a target client to use a controlled cookie.
Researcher notes
The public source bundle is sparse: no CVSS vector, CWE, CPEs, or proof-of-concept details are provided. Treat ownCloud Server before 10.8.0 as the affected version boundary and verify details against the vendor advisory.
Mitigation direction
- Confirm vendor guidance in the ownCloud advisory and release notes.
- Upgrade affected ownCloud Server deployments from versions before 10.8.0.
- Inventory password protected public links and reduce unnecessary public sharing.
- Review access to sensitive public shares after remediation.
Validation and detection
- Identify deployed ownCloud Server versions across environments.
- Check whether any instance is earlier than 10.8.0.
- Inventory active password protected public links.
- Review public-share access logs for unexpected access patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-35948 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://doc.owncloud.com/server/admin_manual/release_notes.htmlCVE reference · x_refsource_MISC
- https://owncloud.com/security-advisories/cve-2021-35948/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.