CVE-2026-21031
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper authorization in AppBlock prior to SMR Jun-2026 Release 1 allows local attacker to launch arbitrary activity. User interaction is required for triggering this vulnerability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceImproper authorization in Samsung's AppBlock application allows a local attacker to launch arbitrary activities within the app. This authorization bypass requires user interaction to trigger, likely through a malicious link or crafted intent that exploits the app's activity launch mechanism.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 15.0= 16.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm AppBlock is installedNavigate to Settings > Apps on the Samsung Android device and search for 'AppBlock', or run 'adb shell pm list packages | grep appblock' via command lineAffected if AppBlock appears in the installed applications list
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Check AppBlock version numberIn Settings > Apps > AppBlock, tap on App info or App details to view the version. On command line, run 'adb shell dumpsys package com.samsung.android.app.block' and look for versionName or versionCodeAffected if The installed version is exactly 15.0 or 16.0
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Verify app is active and has permissionsIn Settings > Apps > AppBlock, confirm the app is not disabled and check if it has permissions to access activity components. The vulnerability requires the activity launch mechanism to be functionalAffected if AppBlock is enabled and can launch activities
The device is affected if AppBlock version 15.0 or 16.0 is installed and the app is enabled, as the improper authorization flaw in activity launching is present in these versions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedApply the SMR Jun-2026 Release 1 patch to AppBlock. Until patched, users should avoid clicking untrusted links or interacting with untrusted content that could trigger the vulnerable activity launch pathway.
SMR Jun-2026 Release 1 or later
- Check current Samsung Android version in Settings > About Phone
- Navigate to Settings > Software Update and tap 'Check for updates'
- Look for and install the SMR Jun-2026 Release 1 update or later
- Verify the update was successfully applied by checking the Android security patch level in Settings > About Phone > Software Information
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,928.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21031 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-21031 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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