CVE-2026-87550: Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attack

Q: How do I fix CVE-2026-87550?

chrome: upgrade to 153.0.8010.36. Exact commands for each OS are on this page.

Q: Is CVE-2026-87550 being exploited?

CVE-2026-87550 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-2026-87550 affect?

CVE-2026-87550 affects chrome. Severity is medium (CVSS 4.3). Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Q: How urgent is CVE-2026-87550?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-87550 is a medium-severity flaw (CVSS 4.3) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-116
Published	2026-09-09
Last modified	2026-09-09

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09 01:17 UTCPublished CVE record published
2026-09-09 20:26 UTCUpdated Record last modified

google chrome UPGRADE

Affected: < 153.0.8010.36

Fixed in: 153.0.8010.36

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 153.0.8010.36 (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-2026-87550?

chrome: upgrade to 153.0.8010.36. Exact commands for each OS are on this page.

Is CVE-2026-87550 being exploited?

CVE-2026-87550 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-2026-87550 affect?

CVE-2026-87550 affects chrome. Severity is medium (CVSS 4.3). Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

How urgent is CVE-2026-87550?

Priority 20/100. No elevated risk signals yet.

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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