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CVE-2021-21123

MediumPublished

Insufficient data validation in File System API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a...

Published: Feb 9, 2021
Updated: Aug 3, 2024
Assigning CNA: Chrome
Evidence observed: Aug 5, 2026

Primary CVSS

6.5/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

10.9%

Moderate · next 30 days

Percentile: 95.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Insufficient data validation in File System API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a crafted HTML page.

Sources

CVE-2021-21123-PoC-Google-ChromePoC
🐱‍💻 👍 Google Chrome - File System Access API - vulnerabilities reported by Maciej Pulikowski | Total Bug Bounty Reward: $5.000 | CVE-2021-21123 and 5 more...

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