CVE-2026-28634

Local privilege escalation via unauthorized USSD request

Published Sep 8, 2026 · Updated Sep 10, 2026

Permission bypass in Google Android 14 through 17 allows local users to send USSD requests without the required permission. PhoneInterfaceManager.handleUssdRequest dispatches a caller-supplied USSD string after a logic error bypasses the required authorization check. A local app needs no additional execution privileges or user interaction; the bounded result is unauthorized submission of carrier USSD requests.

CVSS severityUnavailable
Unscored
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permission bypass in Google Android 14 through 17 allows local users to send USSD requests without the required permission. PhoneInterfaceManager.handleUssdRequest dispatches a caller-supplied USSD string after a logic error bypasses the required authorization check. A local app needs no additional execution privileges or user interaction; the bounded result is unauthorized submission of carrier USSD requests.

The record

CVE
CVE-2026-28634
Published
Sep 8, 2026
Updated
Sep 10, 2026
Vendor
Google Cloud
Product
Android
Classifications
T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14
  2. Affected versionversion=15
  3. Affected versionversion=16
  4. Affected versionversion=16-qpr2
  5. Affected versionversion=17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=14; version=15; version=16; version=16-qpr2; version=17

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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