CVE-2026-121171 Details
Description
Confused deputy in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
A confused deputy vulnerability has been identified in Google Chrome DevTools, prior to version 157.0.8103.38. This vulnerability allows remote attackers to bypass web origin policies through social engineering, by exploiting how DevTools handles network resource fetches from dedicated workers in cross-origin iframes. The issue arises because DevTools misattributes these fetches to the wrong origin, enabling attackers to forge requests that include the user's cookies, thereby manipulating the embedding site.
Users can update to Google Chrome version 157.0.8103.38 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://chromereleases.googleblog.com/2026/11/stable-channel-update-for-desktop.html | [email protected] | Release NotesVendor Advisory |
| https://issues.chromium.org/issues/562238690 | [email protected] | ExploitIssue TrackingMitigationPatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-441 | Unintended Proxy or Intermediary ('Confused Deputy') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| google chrome | < 157.0.8103.38 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 6, 2026 | Initial Analysis | [email protected] |
| Nov 4, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |