What’s Vulnerable › Vulnerabilities

CVE-2022-31742

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-203

Description

An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between invalid key handles and cross-origin key handles. This could have led to cross-origin account linking in violation of WebAuthn goals. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Affected products

• Mozilla Firefox: before 101 — fixed in 101
• Mozilla Firefox ESR: before 91.10 — fixed in 91.10
• Mozilla Thunderbird: before 91.10 — fixed in 91.10

How to fix

Upgrade to a fixed version: Mozilla Firefox 101; Mozilla Firefox ESR 91.10; Mozilla Thunderbird 91.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1730434
• https://www.mozilla.org/security/advisories/mfsa2022-20/
• https://www.mozilla.org/security/advisories/mfsa2022-21/
• https://www.mozilla.org/security/advisories/mfsa2022-22/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1730434
• https://www.mozilla.org/security/advisories/mfsa2022-20/
• https://www.mozilla.org/security/advisories/mfsa2022-21/
• https://www.mozilla.org/security/advisories/mfsa2022-22/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1730434

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