No exploitation reportedFix available

CVE-2026-118337

Q: Is CVE-2026-118337 actively exploited?

Active exploitation of CVE-2026-118337 has not been confirmed. Its EPSS score was 0.2% on 2026-10-29, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-118337?

CVE-2026-118337 has a CVSS v3 base score of 9.3 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

No exploitation reported by the sources we read.

Published2026-10-27
Fixed in156.0.8078.73
WeaknessCWE-284

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 access control in Forms in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

Timeline

dates in UTC

2026-10-2723:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-30 09:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-118337?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-118337?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Google chrome

Branch	Affected	Fixed in	Source
156.0	< 156.0.8078.73	156.0.8078.73	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Google chrome to 156.0.8078.73

Advisories and patches

chromereleases.googleblog.comRelease Notes · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.3read 2026-10-30
NVDweakness (CWE)CWE-284read 2026-10-30
FIRST EPSSEPSS score0.2 %2026-10-29

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Published: 2026-10-27
Last Modified: 2026-10-30
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-118337?

Improper access control in Forms in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

Is CVE-2026-118337 actively exploited?

Active exploitation of CVE-2026-118337 has not been confirmed. Its EPSS score was 0.2% on 2026-10-29, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-118337?

CVE-2026-118337 has a CVSS v3 base score of 9.3 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

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