Detections
Analytics

CVE-2026-87491

high

Description

Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

References

https://www.malwarebytes.com/blog/bugs/2026/09/update-chrome-now-to-protect-against-an-actively-exploited-vulnerability

https://www.bleepingcomputer.com/news/security/new-bluemoon-kit-exploited-windows-and-chrome-zero-day-flaws/

https://securityaffairs.com/198850/security/u-s-cisa-adds-cisco-google-chromium-v8-fortinet-and-citrix-netscaler-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.securityweek.com/chrome-153-patches-seventh-zero-day-of-2026/

https://www.proofpoint.com/us/blog/threat-insight/once-bluemoon-multiple-state-aligned-threat-actors-rapidly-adopt-novel-exploit

https://www.helpnetsecurity.com/2026/09/09/google-chrome-cve-2026-87491-zero-day-flaw/

https://www.cisa.gov/news-events/alerts/2026/09/09/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/google-patches-seventh-chrome-zero-day-exploited-in-attacks-this-year/

https://thehackernews.com/2026/09/chrome-v8-zero-day-exploited-in-wild.html

https://securityaffairs.com/198757/security/google-fixes-the-seventh-actively-exploited-chrome-zero-day-of-2026.html

https://cyberscoop.com/china-espionage-groups-exploit-chain-zero-days/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491

https://issues.chromium.org/issues/543557673

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html

Details

Source: Mitre, NVD

Published: 2026-09-09

Updated: 2026-09-10

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00291

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest