CVE-2026-87550: chrome Improper Encoding — Fix

Description

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)

Is your site exposed to CVE-2026-87550?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.3

MEDIUM

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

EPSS — Exploit Prediction

0.0024

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
google	chrome	< 153.0.8010.36

References

Advisories & Patches

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

Other References

https://issues.chromium.org/issues/518082852

Frequently Asked Questions

What is CVE-2026-87550? +

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) It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-87550? +

CVE-2026-87550 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0024, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-87550? +

CVE-2026-87550 affects products from google, specifically: chrome. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-87550? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-72717

Orval generates type-safe JavaScript clients in TypeScript from OpenAPI v3 and Swagger v2 specifications. Prior to 8.21.0, a ${...} expression …

CVE-2026-82756

Improper Encoding or Escaping of Output vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to inject arbitrary authentication parameters into …

CVE-2026-45570

go-git is an extensible git implementation library written in pure Go. Prior to 5.19.1 and 6.0.0-alpha.4, go-git's SSH transport constructs …

CVE-2025-1795

During an address list folding when a separating comma ends up on a folded line and that line is to …

CVE-2025-32072

Improper Encoding or Escaping of Output vulnerability in The Wikimedia Foundation Mediawiki Core - Feed Utils allows WebView Injection.This issue …

CVE-2025-32078

Improper Encoding or Escaping of Output vulnerability in The Wikimedia Foundation Mediawiki - Version Compare Extension allows Cross-Site Scripting (XSS).This …

CVE-2026-87550