CVE-2026-101897

What it is

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. From 1.20.0 until 1.21.1, the Angular DevTools background service worker accepts chrome.runtime.sendMessage runtime messages from untrusted web pages or third-party content scripts without adequately verifying the message source. An untrusted sender that obtains a valid randomized victim tabId can direct the extension to use chrome.debugger to attach to another browser tab and trigger Chrome DevTools Protocol breakpoints. This can display the debugging banner, pause JavaScript execution, and prevent interaction with the target tab, but it does not provide remote code execution, privilege escalation, or cross-origin access to memory or credentials. This issue is fixed in version 1.21.1.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-14 16:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-29 15:17 UTC Last updatedMost recent change to the record

Details

Published

2026-10-14 16:17 UTC

Last modified

2026-10-29 15:17 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-346

Record status

Awaiting Analysis

Attack profile CVSS 4.0 · 5.1

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

Passive

Confidentiality

None

Integrity

None

Availability

None