What’s Vulnerable › Vulnerabilities

CVE-2024-1555

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-20 · updated 2026-06-17
• Weakness: CWE-290

Description

When opening a website using the `firefox://` protocol handler, SameSite cookies were not properly respected. This vulnerability affects Firefox < 123.

Affected products

• Mozilla Firefox: before 123.0 — fixed in 123.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 123.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1873223
• https://www.mozilla.org/security/advisories/mfsa2024-05/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1873223
• https://www.mozilla.org/security/advisories/mfsa2024-05/

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