Private client content leaks through a lower-trust display or sharing channel
A private marker appears in a notification, background snapshot, clipboard or another user-visible channel outside its promised audience.
Candidate CWE: Map the actual root cause once established.
Test hypothesis#
Seed a private/public fixture pair and compare lock, background and account-switch states through the normal OS UI. Obtain the marker with only the stated observer privileges.
Evidence required#
Capture exact app/OS version, privacy settings, content ownership, reader prerequisites, state transition and the smallest marker exposure. Classify the actual display, notification, clipboard or sharing-channel mechanism; confidentiality loss alone does not establish a specific CWE root cause.
Rule out false positives#
Missing screenshot flags, intended account-owner display, explicitly granted accessibility authority, or a deliberate user-enabled notification preview may not violate the product's security contract.
Playbook and command references#
- Client storage, logs, backup and transport trust — Measure where sensitive client state goes, who can retrieve it, and whether transport rejects invalid peers.
- iOS signing capabilities, links and protected data — Connect entitlements and application groups to actual callers, URL transitions and protected key use.
- Android components, intents and deep links — Trace ordinary-app inputs through exported components, URI grants and links to one protected operation.
Find the associated command snippets
Referenced by these target playbooks#
Report checklist#
- Capture the affected version, configuration, identities, and object ownership.
- Preserve a valid baseline and a negative control.
- Reproduce the forbidden data access, action, or state change on controlled fixtures.
- Explain the intended security rule and why the observed behavior violates it.
- State prerequisites, uncertainty, cleanup, and the smallest demonstrated impact.
Conditional ATT&CK mapping#
No direct ATT&CK mapping selected. Record the weakness and demonstrated impact without forcing an adversary-behavior classification. See the mapping guide.