Security readout for executives and security teams
Plain-English summary
Nextcloud's iOS app could expose sharee search activity outside the local Nextcloud server. Before version 3.4.2, the app used the lookup server by default instead of only using local search unless the user explicitly chose global search.
Executive priority
Treat as a moderate privacy issue. It is fixed and should be handled through mobile app update enforcement, especially where sharee searches may reveal sensitive internal or external relationships.
Technical view
CVE-2021-22912 is a CWE-200 information disclosure issue in Nextcloud iOS before 3.4.2. Sharee searches used the lookup server by default, contrary to the expected local-only behavior unless global search was selected. The source bundle names 3.4.2 as the fixed version.
Likely exposure
Exposure is likely limited to organizations or users running Nextcloud iOS app versions before 3.4.2 and using sharee search. The evidence does not identify affected server versions or other client platforms.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not in KEV. This appears to be a privacy and data-disclosure risk from unintended lookup behavior, not a remote code execution issue.
Researcher notes
Available evidence is narrow: the bundle identifies the incorrect default lookup behavior, CWE-200, and fixed version. It does not provide CVSS, proof of active exploitation, or detailed impact metrics. Avoid expanding affected scope beyond Nextcloud iOS before 3.4.2.
Mitigation direction
- Upgrade Nextcloud iOS app to version 3.4.2 or later.
- Review Nextcloud's advisory for any newer vendor guidance.
- Prioritize users handling sensitive identities, clients, or regulated data.
- Confirm mobile device management policies require the fixed app version.
Validation and detection
- Inventory deployed Nextcloud iOS app versions across managed devices.
- Verify no managed devices run Nextcloud iOS before 3.4.2.
- Review user groups that rely on sharee search workflows.
- Check vendor advisory history for superseding fixes or notes.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-22912 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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://hackerone.com/reports/1167919CVE reference · x_refsource_MISC
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m7w4-cvjr-76mhCVE 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.