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No exploitation reportedAwaiting NVD analysis

CVE-2026-121236

Chromium Network Input Validation Failure Enables Origin Policy Bypass

No exploitation reported by the sources we read.

  • Published2026-11-03
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper input validation in Network in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)

Timeline

dates in UTC
  1. 2026-11-0320:42CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As Chrome, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Google Chrome
    Affected
    • ≥ 157.0.8103.38, < 157.0.8103.38fixed in 157.0.8103.38custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • chromiumEchoall versions · no fixed version listed

Vendor advisories

  • CVE-2026-121236 Red Hat Product Security

    chromium-browser: Improper input validation in Network

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2026-11-03
Last Modified
2026-11-04
NVD status
Undergoing Analysis
GitHub Advisory
GHSA-2r8m-hp34-qgwf

Frequently asked questions

What is CVE-2026-121236?

Improper input validation in Network in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)

Is CVE-2026-121236 actively exploited?

Active exploitation of CVE-2026-121236 has not been confirmed. Its EPSS score was 0.2% on 2026-11-04, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-121236?

CVE-2026-121236 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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