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HIGH

CVE-2026-87505

CVSS v3

8.1

HIGH

EPSS Score

0.3 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

Technical details

Published
2026-09-09
Last Modified
2026-09-10

Frequently asked questions

What is CVE-2026-87505?

Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

Is CVE-2026-87505 actively exploited?

Active exploitation of CVE-2026-87505 has not been confirmed. Its EPSS score was 0.3% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-87505?

CVE-2026-87505 has a CVSS v3 base score of 8.1 (HIGH severity).

Is CVE-2026-87505 affecting your environment?

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