What’s Vulnerable › Vulnerabilities

CVE-2021-30558

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-01-02 · updated 2026-06-17

Description

Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chrome security severity: Medium)

Affected products

• Google Chrome: before 91.0.4472.77 — fixed in 91.0.4472.77

How to fix

Upgrade to a fixed version: Google Chrome 91.0.4472.77. Check the vendor advisory for mitigations.

References

• https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
• https://crbug.com/916326
• https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
• https://crbug.com/916326

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