CVE-2026-0088 Overview
CVE-2026-0088 is a high-severity vulnerability in the Android CertInstaller component. The flaw resides in the getCallingAppLabel method of CertInstaller.java. A misleading or insufficient user interface allows a sensitive security dialogue to be hidden from the user. This UI confusion weakness, classified as [CWE-451], can lead to local privilege escalation without requiring user interaction or additional execution privileges. Google addressed the issue in the Android Security Bulletin for June 2026. Affected releases include Android 14, Android 15, and Android 16 including QPR2 beta builds.
Critical Impact
A local attacker can suppress or spoof the certificate installation security dialogue, tricking the operating system into granting elevated privileges with no user interaction.
Affected Products
- Google Android 14.0
- Google Android 15.0
- Google Android 16.0 (including QPR2 Beta 1, Beta 2, and Beta 3)
Discovery Timeline
- 2026-06-01 - Google publishes fix in the Android Security Bulletin
- 2026-06-01 - CVE-2026-0088 published to NVD
- 2026-06-03 - Last updated in NVD database
Technical Details for CVE-2026-0088
Vulnerability Analysis
The vulnerability resides in the getCallingAppLabel function within CertInstaller.java, the Android system component responsible for prompting users before installing certificates. The function retrieves the calling application's label for display inside the certificate installation confirmation dialogue. Because the label is sourced from the calling app, an attacker-controlled application can supply content that hides or misrepresents the security prompt. The result is a UI spoofing condition that aligns with [CWE-451], User Interface Misrepresentation of Critical Information.
Successful exploitation allows a low-privileged local application to cause the user to authorize a privileged action without understanding what is being approved. Once a malicious certificate is installed into the system trust store, the attacker can intercept TLS traffic, validate forged signatures, or gain elevated capabilities within the Android security model.
Root Cause
The root cause is improper handling of untrusted display data passed to a high-trust security dialogue. The getCallingAppLabel path does not sufficiently constrain or sanitize the calling application's label, allowing crafted strings or overflow conditions to obscure the system warning text shown to the user.
Attack Vector
The attack vector is local. A malicious application installed on the device invokes CertInstaller with manipulated identity metadata. Because exploitation does not require user interaction beyond launching the malicious app, the attacker can chain this flaw with standard installation channels to escalate from app-level privileges to system trust modifications.
No public exploit code or proof-of-concept has been published for CVE-2026-0088. Refer to the Android Security Bulletin June 2026 for the authoritative technical description.
Detection Methods for CVE-2026-0088
Indicators of Compromise
- Unexpected certificate entries appearing in the user or system trust store on Android 14, 15, or 16 devices.
- Recently installed third-party applications that invoke the CertInstaller activity without a clear functional reason.
- Anomalous TLS interception behavior or certificate pinning failures reported by enterprise applications.
Detection Strategies
- Inventory installed CA certificates across managed Android fleets and compare against an approved baseline.
- Use Mobile Device Management (MDM) attestation and Play Protect signals to flag devices running unpatched Android builds prior to the June 2026 security patch level.
- Review application install logs for packages that request the android.credentials.INSTALL intent or interact with com.android.certinstaller.
Monitoring Recommendations
- Monitor the ro.build.version.security_patch property to confirm devices report a patch level of 2026-06-01 or later.
- Alert on certificate store modifications captured through enterprise mobility telemetry.
- Track outbound TLS sessions terminating at untrusted intermediaries, which can indicate a successful rogue CA installation.
How to Mitigate CVE-2026-0088
Immediate Actions Required
- Apply the Android security patch level 2026-06-01 or later to all Android 14, 15, and 16 devices.
- Restrict sideloading and enforce installation only from vetted application sources through MDM policy.
- Audit the user-installed certificate store on managed devices and remove any unrecognized certificate authorities.
Patch Information
Google released the fix as part of the Android Security Bulletin June 2026. Device manufacturers (OEMs) distribute the corresponding patch through their standard over-the-air update channels. Confirm that the device security patch level reflects 2026-06-01 or newer after the update completes.
Workarounds
- Disable installation of certificates from non-administrator sources via enterprise device policy where supported.
- Enforce work profile separation so that user-installed certificates do not affect managed application traffic.
- Educate users to cancel any unexpected certificate installation dialogue and report the originating application to IT.
# Verify the Android security patch level on a connected device
adb shell getprop ro.build.version.security_patch
# Expected output for patched devices: 2026-06-01 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
