CVE-2022-31742

Name: CVE-2022-31742
Creator: NVD / NIST
Published: 2022-12-22T20:15:29.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2022-31742 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.59%

43.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 101
Mozilla	Firefox Esr	< 91.10
Mozilla	Thunderbird	< 91.10

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1730434Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1730434Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1730434Issue Tracking, Permissions Required, Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-31742?

How severe is CVE-2022-31742?

CVE-2022-31742 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31742?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-31742?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST