CVE-2026-12459: Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to i

Q: How do I fix CVE-2026-12459?

chrome: upgrade to 149.0.7827.155. Exact commands for each OS are on this page.

Q: Is CVE-2026-12459 being exploited?

CVE-2026-12459 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-12459 affect?

CVE-2026-12459 affects chrome. Severity is medium (CVSS 6.1). Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)

Q: How urgent is CVE-2026-12459?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-12459 is a medium-severity flaw (CVSS 6.1) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 13:20 UTCPublished CVE record published
2026-10-26 12:10 UTCUpdated Record last modified

google chrome UPGRADE

Affected: < 149.0.7827.155

Fixed in: 149.0.7827.155

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chrome || rpm -q chrome || chrome --version

2. UPGRADE to 149.0.7827.155 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chrome

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chrome

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-12459?

chrome: upgrade to 149.0.7827.155. Exact commands for each OS are on this page.

Is CVE-2026-12459 being exploited?

CVE-2026-12459 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-12459 affect?

CVE-2026-12459 affects chrome. Severity is medium (CVSS 6.1). Inappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)

How urgent is CVE-2026-12459?

Priority 23/100. No elevated risk signals yet.

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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