CVE-2023-21239

Cross-user image disclosure via unchecked CallStyle URIs

Published Jul 12, 2023 · Updated Nov 6, 2024

Information disclosure in Google Android 12, 12L, and 13 allows local users to read cross-user notification images without interaction. Notification.visitUris omits CallStyle-related image URIs, so the framework grants content access without verifying that the posting app can grant those URIs. A low-privileged local app must submit a crafted CallStyle notification; exposure is limited to image data reachable across Android user boundaries.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Google Android 12, 12L, and 13 allows local users to read cross-user notification images without interaction. Notification.visitUris omits CallStyle-related image URIs, so the framework grants content access without verifying that the posting app can grant those URIs. A low-privileged local app must submit a crafted CallStyle notification; exposure is limited to image data reachable across Android user boundaries.

The record

CVE
CVE-2023-21239
Published
Jul 12, 2023
Updated
Nov 6, 2024
Vendor
Google
Product
Android
Classifications
CWE-384, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record 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=12
  2. Affected versionversion=12L
  3. Affected versionversion=13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google · Androidversion=12; version=12L; version=13

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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