Security readout for executives and security teams
Plain-English summary
CVE-2019-5452 is a privacy issue in the Nextcloud Android app before version 3.6.2. The app’s lock protection could be bypassed in a way that exposed file thumbnails through Android’s content provider, even when the app lock had not been unlocked.
Executive priority
Treat as a privacy and mobile data exposure issue. It is not reported as actively exploited, but organizations handling sensitive documents in Nextcloud should ensure Android clients are updated, especially on unmanaged or shared devices.
Technical view
The issue is categorized as CWE-284, improper access control. In affected Nextcloud Android app versions before 3.6.2, thumbnail data could be accessed through the Android content provider despite the app lock state. Public sources do not provide CVSS scoring or evidence of broader file disclosure.
Likely exposure
Exposure is limited to Android devices running the Nextcloud client before 3.6.2 with app lock protection enabled. The disclosed impact is thumbnail leakage, not confirmed full file access. Organizations using managed mobile fleets should check installed app versions.
Exploitation context
No CISA KEV listing is present, and the provided sources do not state active exploitation. Exploitation context appears local or app-environment dependent because the issue involves Android content provider access and app lock bypass behavior.
Researcher notes
The public record is sparse: no CVSS vector is provided, and the main detail is thumbnail leakage via Android content provider access before app lock resolution. Avoid assuming full file compromise without additional vendor evidence.
Mitigation direction
- Upgrade the Nextcloud Android app to version 3.6.2 or later.
- Use mobile device management to identify and update outdated installations.
- Review Nextcloud’s advisory or HackerOne report for any vendor-specific guidance.
Validation and detection
- Inventory Android devices with the Nextcloud client installed.
- Confirm installed app versions are 3.6.2 or later.
- Verify app lock behavior after update in standard mobile QA testing.
- Check whether sensitive thumbnails were cached on shared or unmanaged devices.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2019-5452 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/534541CVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.