CVE-2026-46419: CWE-253 Incorrect Check of Function Return Value in Yubico webauthn-server-core
CVE-2026-46419 is a high-severity vulnerability in Yubico's webauthn-server-core version 2. 8. 0 where an incorrect check of a function's return value in the second factor authentication flow can lead to impersonation. This flaw affects the integrity and confidentiality of the authentication process. The vulnerability has a CVSS score of 7. 5, indicating a significant risk if exploited. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
Yubico webauthn-server-core version 2.8.0 contains a vulnerability classified as CWE-253 due to improper checking of a function's return value during the second factor authentication flow. This incorrect validation can allow an attacker to impersonate a legitimate user, compromising authentication security. The vulnerability is rated with a CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting high impact on confidentiality, integrity, and availability. No patch or official remediation has been documented yet, and the product is not a cloud service, so remediation depends on vendor updates.
Potential Impact
Successful exploitation of this vulnerability can lead to user impersonation in the second factor authentication process, resulting in unauthorized access to protected resources. The impact affects confidentiality, integrity, and availability of the authentication system. There are no known active exploits reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider additional compensating controls in their authentication environment. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-46419: CWE-253 Incorrect Check of Function Return Value in Yubico webauthn-server-core
Description
CVE-2026-46419 is a high-severity vulnerability in Yubico's webauthn-server-core version 2. 8. 0 where an incorrect check of a function's return value in the second factor authentication flow can lead to impersonation. This flaw affects the integrity and confidentiality of the authentication process. The vulnerability has a CVSS score of 7. 5, indicating a significant risk if exploited. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Yubico webauthn-server-core version 2.8.0 contains a vulnerability classified as CWE-253 due to improper checking of a function's return value during the second factor authentication flow. This incorrect validation can allow an attacker to impersonate a legitimate user, compromising authentication security. The vulnerability is rated with a CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting high impact on confidentiality, integrity, and availability. No patch or official remediation has been documented yet, and the product is not a cloud service, so remediation depends on vendor updates.
Potential Impact
Successful exploitation of this vulnerability can lead to user impersonation in the second factor authentication process, resulting in unauthorized access to protected resources. The impact affects confidentiality, integrity, and availability of the authentication system. There are no known active exploits reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider additional compensating controls in their authentication environment. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-05-13T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a054a4bcbff5d86105ea32e
Added to database: 5/14/2026, 4:06:35 AM
Last enriched: 5/14/2026, 4:21:21 AM
Last updated: 5/14/2026, 5:10:10 AM
Views: 4
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