CVE-2026-13863 - Vulnerability Details

Description

Insufficient validation of untrusted input in CustomTabs in Google Chrome on Android prior to 150.0.7871.47 allowed a local attacker to perform privilege escalation via a malicious file. (Chromium security severity: Medium)

Published: 2026-06-30

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

An insufficient validation of untrusted input in Google Chrome on Android before version 150.0.7871.47 allows a local attacker who can supply a malicious file to gain elevated privileges on the device. The flaw, identified as a CWE‑20 input validation weakness, enables the attacker to elevate privilege on the device’s resources.

Affected Systems

Google Chrome for Android versions earlier than 150.0.7871.47 are affected. The vulnerability exists on builds of Chrome for Android that include the CustomTabs component prior to the upgrade.

Risk and Exploitability

The CVSS score of 7.8 indicates a high severity, while the EPSS score of less than 1% reflects a very low probability of exploitation. The flaw is not listed in the CISA KEV catalog. The likely attack vector is local; the attacker must be able to trigger CustomTabs with a malicious file, such as by opening a file or link that passes through the component, to achieve privilege escalation on the device.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Google

Chrome

affected

Version	Status	Constraints
`150.0.7871.47`	affected	< 150.0.7871.47

No data.

Vendor Product Confidence Versions

Google

Chrome

100%

Version	Status	Scheme	Platform
`150.0.7871.47`	affected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Install the latest Chrome update (7871.47) or restrict applications that use CustomTabs to handle untrusted files, limiting the attack surface.
Validate file types rigorously before passing them to CustomTabs, ensuring only trusted formats are accepted to mitigate the CWE‑20 input validation weakness.
Configure or modify the application to restrict CustomTabs to trusted content only, for example by setting a whitelist of MIME types or using secure intent filters, thereby limiting exposure to untrusted files.

Generated by OpenCVE AI on July 21, 2026 at 17:05 UTC.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DLA	DLA-4672-1	chromium security update
Debian DSA	DSA-6378-1	chromium security update

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0012.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0175352312.html
https://issues.chromium.org/issues/496012495

History

Tue, 21 Jul 2026 17:30:00 +0000

Type	Values Removed	Values Added
Title	Insufficient validation of untrusted input in Chrome CustomTabs leading to local privilege escalation

Thu, 16 Jul 2026 00:30:00 +0000

Type	Values Removed	Values Added
Title		Insufficient validation of untrusted input in Chrome CustomTabs leading to local privilege escalation

Tue, 14 Jul 2026 21:00:00 +0000

Type	Values Removed	Values Added
Title	Privilege Escalation via Malicious File in Chrome CustomTabs

Tue, 14 Jul 2026 01:45:00 +0000

Type	Values Removed	Values Added
Title		Privilege Escalation via Malicious File in Chrome CustomTabs

Sun, 12 Jul 2026 21:30:00 +0000

Type	Values Removed	Values Added
Title	CustomTabs Input Validation Weakness Leading to Local Privilege Escalation in Chrome for Android

Sat, 11 Jul 2026 03:00:00 +0000

Type	Values Removed	Values Added
Title		CustomTabs Input Validation Weakness Leading to Local Privilege Escalation in Chrome for Android

Fri, 10 Jul 2026 04:30:00 +0000

Type	Values Removed	Values Added
Title	Privilege Escalation via Insufficient Validation in Chrome CustomTabs on Android

Wed, 08 Jul 2026 08:45:00 +0000

Type	Values Removed	Values Added
Title		Privilege Escalation via Insufficient Validation in Chrome CustomTabs on Android

Tue, 07 Jul 2026 16:30:00 +0000

Type	Values Removed	Values Added
Title	Local Privilege Escalation via Untrusted Input in Chrome CustomTabs

Mon, 06 Jul 2026 16:45:00 +0000

Type	Values Removed	Values Added
Title		Local Privilege Escalation via Untrusted Input in Chrome CustomTabs

Mon, 06 Jul 2026 04:00:00 +0000

Type	Values Removed	Values Added
Title	Invalid CustomTabs Input Validation Enables Local Privilege Escalation

Sun, 05 Jul 2026 15:15:00 +0000

Type	Values Removed	Values Added
Title		Invalid CustomTabs Input Validation Enables Local Privilege Escalation

Sun, 05 Jul 2026 04:15:00 +0000

Type	Values Removed	Values Added
Title	Local Privilege Escalation via Malformed CustomTabs File in Google Chrome on Android

Sat, 04 Jul 2026 12:00:00 +0000

Type	Values Removed	Values Added
Title		Local Privilege Escalation via Malformed CustomTabs File in Google Chrome on Android

Sat, 04 Jul 2026 00:15:00 +0000

Type	Values Removed	Values Added
Title	Privilege Escalation via CustomTabs Input Validation in Google Chrome on Android

Fri, 03 Jul 2026 09:30:00 +0000

Type	Values Removed	Values Added
Title		Privilege Escalation via CustomTabs Input Validation in Google Chrome on Android

Thu, 02 Jul 2026 20:15:00 +0000

Type	Values Removed	Values Added
Title	Privilege Escalation via Malicious File in Chrome CustomTabs

Thu, 02 Jul 2026 05:00:00 +0000

Type	Values Removed	Values Added
Title		Privilege Escalation via Malicious File in Chrome CustomTabs

Wed, 01 Jul 2026 22:45:00 +0000

Type	Values Removed	Values Added
Title	Local Privilege Escalation via Malformed CustomTabs Files in Chrome for Android

Wed, 01 Jul 2026 16:45:00 +0000

Type	Values Removed	Values Added
Title		Local Privilege Escalation via Malformed CustomTabs Files in Chrome for Android

Wed, 01 Jul 2026 14:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 01 Jul 2026 09:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Google Google chrome
Vendors & Products		Google Google chrome

Wed, 01 Jul 2026 06:30:00 +0000

Type	Values Removed	Values Added
Title	Insufficient Validation in Chrome CustomTabs Enables Local Privilege Escalation

Wed, 01 Jul 2026 01:30:00 +0000

Type	Values Removed	Values Added
Title		Insufficient Validation in Chrome CustomTabs Enables Local Privilege Escalation

Tue, 30 Jun 2026 23:15:00 +0000

Type	Values Removed	Values Added
Description		Insufficient validation of untrusted input in CustomTabs in Google Chrome on Android prior to 150.0.7871.47 allowed a local attacker to perform privilege escalation via a malicious file. (Chromium security severity: Medium)
Weaknesses		CWE-20
References		https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0175352312.html https://issues.chromium.org/issues/496012495

Subscriptions

Google Chrome

MITRE

Status: PUBLISHED

Assigner: Chrome

Published: 2026-06-30T22:38:00.908Z

Updated: 2026-07-02T03:55:29.658Z

Reserved: 2026-06-29T23:03:36.660Z

Link: CVE-2026-13863

Vulnrichment

Updated: 2026-07-01T13:18:11.927Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-07-21T17:15:09Z

Weaknesses

CWE-20
Improper Input Validation

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

Exploitation none

Automatable no

Technical Impact total

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object