Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery via crafted HTML, no attacker privileges needed, single user interaction required; scope unchanged as privilege escalation appears browser-contained per S:U vendor assignment.
Primary rating from Vendor (google).
CVSS VectorVendor: google
Lifecycle Timeline
4DescriptionCVE.org
Insufficient validation of untrusted input in Contextual Tasks in Google Chrome prior to 151.0.7922.109 allowed a remote attacker to perform privilege escalation via a crafted HTML page. (Chromium security severity: High)
AnalysisAI
Privilege escalation in Google Chrome's Contextual Tasks feature (prior to 151.0.7922.109) allows a remote attacker to escalate privileges by luring a victim to a crafted HTML page that delivers insufficiently validated untrusted input. The vulnerability carries a CVSS 8.8 score, reflecting high confidentiality, integrity, and availability impact with no prior authentication required from the attacker. No public exploit code or active exploitation (CISA KEV) has been identified at time of analysis, though the low attack complexity and Chrome's ubiquitous deployment surface make prompt patching a priority.
Technical ContextAI
The vulnerability resides in Chrome's 'Contextual Tasks' subsystem, a feature in the Chromium browser engine responsible for processing contextual user interactions. The root cause is classified as CWE-20 (Improper Input Validation): the component fails to adequately validate or sanitize untrusted input originating from a renderer-supplied HTML page before acting on it, enabling attacker-controlled data to influence privileged execution paths. The attack surface is the HTML rendering pipeline - standard for Chromium-based vulnerabilities - where crafted page content can trigger logic in features that were not designed to handle adversarial input. CPE-level specificity narrows the affected scope to Chrome versions below 151.0.7922.109 across all platforms supported by that build line.
RemediationAI
Update Google Chrome to version 151.0.7922.109 or later immediately; this is the vendor-released patch confirmed via the Chrome stable channel advisory at chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_01193673229.html. Chrome auto-updates by default on most managed and consumer systems, but administrators should verify deployment via fleet management tools (e.g., Google Admin, SCCM, or Munki). As a compensating control prior to patching, organizations can restrict access to untrusted or external web content via proxy/DNS filtering - note this does not protect against attacker-controlled content embedded in otherwise-trusted sites. Disabling JavaScript globally would prevent the crafted-HTML attack surface but carries severe usability trade-offs. Chromium-based browsers built on this codebase (Edge, Brave, etc.) should also be assessed for exposure against their respective upstream patch timelines.
Same weakness CWE-20 – Improper Input Validation
View allSame technique Privilege Escalation
View allVendor StatusVendor
SUSE
Severity: CriticalShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-54269
GHSA-xpp8-5h37-jfv5