Is CVE-2026-87491 actively exploited?

Yes. Previdian tracks CVE-2026-87491 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has Previdian observed?

Previdian has not yet recorded sensor-observed exploitation attempts for CVE-2026-87491. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-87491 affects Google Chrome. Reported affected version: 153.0.8010.36 to < 153.0.8010.36.

Yes. CVE-2026-87491 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Previdian attested it 11 hours ahead of CISA.

CVE-2026-87491 Exploited in the Wild — Chrome

Q: What is CVE-2026-87491?

CVE-2026-87491 is an unauthenticated vulnerability affecting Google Chrome. 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)

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2026-87491 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Previdian attested it 11 hours ahead of CISA.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-87491 is an unauthenticated vulnerability affecting Google Chrome. 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...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Google / Chrome affected before 153.0.8010.36.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Chrome

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)

Vendor Product Affected Status

Google Chrome Before 153.0.8010.36 Affected

Published: 09 Sep 2026
Exploitation Reported: 09 Sep 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: Required

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-87491
chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_08... chromereleases.googleblog.com · CVE Record https://chromereleases.googleblog.com/2026/09/stable-channel-update-f...
issues.chromium.org/issues/543557673 issues.chromium.org · CVE Record https://issues.chromium.org/issues/543557673

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CyberInsider

Recorded 09 Sep 2026

Independent exploitation attestation added to the Previdian record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
CyberInsider First	2026-09-09 08:00 UTC
TheHackerNews	2026-09-09 09:11 UTC
CISA	2026-09-09 19:20 UTC
CVE	2026-09-09 20:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts: 0; 0; 0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.8 High

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

EPSS

0.3%

Weaknesses

Out-of-bounds Write CWE-787

Recent mention · NCSC Security Advisories

NCSC-2026-0354 [1.00] [M/H] Kwetsbaarheid verholpen in Google Chrome

Google heeft een zeroday-kwetsbaarheid verholpen in de V8 JavaScript engine van Google Chrome. Google meldt dat de kwetsbaarheid met kenmerk CVE-2026-87491 actief wordt misbruikt. Het betreft een out-of-bounds write in de V8-engine van Google Chrome, die voorkomt in versies...

Read full advisory

All Mentions

Recent mention · NCSC Security Advisories

NCSC-2026-0354 [1.00] [M/H] Kwetsbaarheid verholpen in Google Chrome

NCSC Security Advisories · 09 Sep 2026

Google heeft een zeroday-kwetsbaarheid verholpen in de V8 JavaScript engine van Google Chrome. Google meldt dat de kwetsbaarheid met kenmerk CVE-2026-87491 actief wordt misbruikt. Het betreft een out-of-bounds write in de V8-engine van Google Chrome, die voorkomt in versies vóór 153.0.8010.36. Een kwaadwillende kan een speciaal vervaardigde HTML-pagina gebruiken om de kwetsbaarheid te activeren en binnen de sandbox willekeurige code uit te voeren. De kwetsbaarheid wordt veroorzaakt door onjuiste bounds checking in het geheugenbeheer van V8, wat kan leiden tot geheugenbeschadiging. Succesvol...

Recent mention · TheHackerNews

Chrome V8 Zero-Day Exploited in the Wild Enables Code Execution Inside Sandbox

TheHackerNews · 09 Sep 2026

Google on Thursday released updates to patch 230 security vulnerabilities, including one that has come under active exploitation in the wild. The medium-severity vulnerability, assigned the CVE identifier CVE-2026-87491 (CVSS score: N/A), has been described as an out-of-bounds bug in V8, Chrome's JavaScript and WebAssembly engine. "Out-of-bounds write in V8 in Google Chrome prior to

Recent mention · CyberInsider

Google fixes second actively exploited Chrome zero-day in under five days

CyberInsider · 09 Sep 2026

Google has released Chrome 153 to the stable channel with fixes for 230 security vulnerabilities, including a V8 memory corruption flaw that Google says is already being exploited in attacks. The actively exploited vulnerability is tracked as CVE-2026-87491 and is described as an out-of-bounds write in V8, Chrome’s JavaScript and WebAssembly engine. It was reported … The post Google fixes second actively exploited Chrome zero-day in under five days appeared first on CyberInsider.

Recent mention · Google Chrome Releases

Stable Channel Update for Desktop

Google Chrome Releases · 08 Sep 2026

The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks.Chrome 153.0.8010.36 (Linux) 153.0.8010.36/.37 Windows/Mac contains a number of fixes and improvements -- a list of changes is available in the log. Watch out for upcoming Chrome and Chromium blog posts about new features and big efforts delivered in 153.Security Fixes and RewardsNote: Access to bug details and links may be kept restricted until a majority of users are updated with a fix. We will also retain restrictions if the...

Timeline

From disclosure to observed exploitation

09 Sep 2026
KEV confirmed by CVE

Exploitation attested by an external source
09 Sep 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
09 Sep 2026
KEV confirmed by TheHackerNews

Exploitation attested by an external source
09 Sep 2026
Added to Previdian KEV Feed

High-confidence, third-party attested exploitation
09 Sep 2026
CVE published

Vulnerability disclosed publicly
08 Sep 2026
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-87491

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2026-87491",
  "confidence": "Confirmed",
  "cvss_score": 8.8,
  "cvss_estimated": false,
  "epss_score": 0.00291,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-87491

Chrome

Tags

CVE References

Exploited in the wild

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Weaknesses

NCSC-2026-0354 [1.00] [M/H] Kwetsbaarheid verholpen in Google Chrome

All Mentions

KEV confirmed by CVE

Added to CISA KEV

KEV confirmed by TheHackerNews

Added to Previdian KEV Feed

CVE published

CVE ID reserved

Automate this intelligence