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, potentially allowing an attacker to bypass second factor verification. The vulnerability has a CVSS score of 7.5, indicating a significant risk. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time. Users of version 2.8.
AI Analysis
Technical Summary
Yubico webauthn-server-core (java-webauthn-server) version 2.8.0 contains a vulnerability (CWE-253) due to improper checking of a function's return value during the second factor authentication flow. This incorrect validation can lead to impersonation attacks, compromising authentication security. The vulnerability is rated high severity with a CVSS 3.1 score of 7.5 (Network attack vector, High attack complexity, Low privileges required, No user interaction, Unchanged scope, High impact on confidentiality, integrity, and availability). No patch or official remediation level is currently documented, and the product is not a cloud service, so remediation responsibility lies with the user.
Potential Impact
Successful exploitation of this vulnerability can allow an attacker to impersonate a legitimate user by bypassing the second factor authentication mechanism. This compromises the confidentiality, integrity, and availability of the authentication process, potentially leading to unauthorized access to protected systems or data. The high CVSS score reflects the serious impact on security if exploited.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary workaround is documented, users should monitor Yubico's advisories for updates. Until a patch is available, consider additional compensating controls around authentication processes to reduce risk.
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, potentially allowing an attacker to bypass second factor verification. The vulnerability has a CVSS score of 7.5, indicating a significant risk. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time. Users of version 2.8.
CVSS v3.1
Score 7.5high
Affected software
pkg:maven/com.yubico/webauthn-server-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Yubico webauthn-server-core (java-webauthn-server) version 2.8.0 contains a vulnerability (CWE-253) due to improper checking of a function's return value during the second factor authentication flow. This incorrect validation can lead to impersonation attacks, compromising authentication security. The vulnerability is rated high severity with a CVSS 3.1 score of 7.5 (Network attack vector, High attack complexity, Low privileges required, No user interaction, Unchanged scope, High impact on confidentiality, integrity, and availability). No patch or official remediation level is currently documented, and the product is not a cloud service, so remediation responsibility lies with the user.
Potential Impact
Successful exploitation of this vulnerability can allow an attacker to impersonate a legitimate user by bypassing the second factor authentication mechanism. This compromises the confidentiality, integrity, and availability of the authentication process, potentially leading to unauthorized access to protected systems or data. The high CVSS score reflects the serious impact on security if exploited.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary workaround is documented, users should monitor Yubico's advisories for updates. Until a patch is available, consider additional compensating controls around authentication processes to reduce risk.
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: 05/14/2026, 04:06:35 UTC
Last enriched: 05/21/2026, 12:21:35 UTC
Last updated: 07/03/2026, 08:51:24 UTC
Views: 80
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.