Security readout for executives and security teams
Plain-English summary
This is a low-severity privacy issue in the Nextcloud Android client before 3.16.1. A malicious Android app on the same device could access limited Nextcloud shared-preference data only if the user initiated sharing and selected that malicious app. The disclosed data included items such as push tokens and account name.
Executive priority
Treat as routine mobile hygiene unless your organization has many unmanaged Android devices or sensitive Nextcloud usage. Prioritize updating the app through normal endpoint management rather than emergency response.
Technical view
The issue is CWE-200 information exposure with CVSS 3.1 score 3.9. Attack prerequisites are physical/local device context, a malicious app already present, low privileges, and user interaction through Android sharing. Sources state the bug is fixed in Nextcloud Android client 3.16.1.
Likely exposure
Exposure is most likely in organizations with Android users running the Nextcloud client earlier than 3.16.1, especially unmanaged or slow-updating mobile devices. Impact is limited to data in shared preferences, not full account takeover based on the supplied sources.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Exploitation required a malicious app on the same device and the victim choosing that app in a sharing flow. This is not described as remotely exploitable.
Researcher notes
The metadata lists CWE-200 and CVSS vector AV:P/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L. Description and references consistently point to the Nextcloud Android client, while affected metadata names nextcloud/security-advisories. No source in the bundle supports active exploitation or broader product impact.
Mitigation direction
- Update Nextcloud Android client to version 3.16.1 or later.
- Ask users to avoid sharing Nextcloud content to untrusted Android apps.
- Check vendor advisory and app store deployment status for managed devices.
- Review mobile inventories for older Nextcloud Android installations.
Validation and detection
- Inventory Android devices for Nextcloud client versions before 3.16.1.
- Confirm MDM or managed app stores enforce version 3.16.1 or later.
- Review available mobile telemetry for suspicious share-flow app selections.
- Document any remaining unmanaged devices as residual exposure.
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-2021-32695 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
- Low
- CVSS
- 3.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L0.53.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.9LowVector: CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-25m9-cf6c-qf2cCVE reference · x_refsource_CONFIRM
- https://github.com/nextcloud/android/pull/8433CVE reference · x_refsource_MISC
- https://hackerone.com/reports/1142918CVE 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.