Google Chrome CVE-2026-11242

Exploitation requires the attacker to have already compromised Chrome's renderer process, which means this bug is not directly reachable from arbitrary web content and must be chained with a separate renderer-level vulnerability (typically an RCE in V8, Blink, or another renderer component). The attacker must then serve a crafted HTML page through the compromised renderer that exercises the unvalidated input path in the Plugins component to cross origin boundaries. The victim must be running a Chrome desktop build prior to 149.0.7827.53; the CVSS vector lists PR:N and UI:N, but these do not capture the renderer-compromise precondition called out explicitly in the description, so the practical authentication/interaction barrier is the chained renderer exploit rather than a fresh user action. There is no indication that a specific non-default Chrome setting or enterprise policy is required.

The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) yields 7.5 by treating the issue as a network-reachable, no-privilege, no-interaction confidentiality break, but this scoring is in tension with the description's clear prerequisite that the attacker must first have compromised the renderer process - a substantial precondition that effectively requires chaining with a separate renderer RCE. Chromium's own severity rating of Low and the absence of CISA KEV listing or public POC indicate this is not a standalone priority bug; it is realistically a useful secondary primitive within a multi-bug exploit chain rather than a single-shot remote attack. EPSS data was not provided, but the bug's chained-exploit nature, the Chromium Low rating, and the rapid availability of a patched Stable channel build collectively suggest low real-world urgency outside of high-value targeting scenarios. The mismatch between PR:N in the CVSS vector and the description's renderer-compromise requirement should be noted: defenders prioritizing strictly off CVSS may overstate exposure.

An attacker first lands a separate renderer-process compromise - for example, by chaining a known V8 or DOM memory-safety bug delivered through a malicious or compromised website - and from inside the sandboxed renderer serves a crafted HTML page that triggers the Plugins input-validation flaw to read data belonging to a different origin (for example, contents of an authenticated banking or webmail tab the victim has open). The leaked cross-origin data is then exfiltrated back through the attacker's controlled site. No public exploit has been identified at time of analysis, and the renderer-compromise prerequisite makes this realistic primarily as a secondary primitive in a chained exploit.