CVE-2026-56450
CVE-2026-56450 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.
Key facts
- Severity: Medium (CVSS 4.0 base score 5.1)
- EPSS exploit prediction: 0% (25th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-38239
- Weakness: CWE-307
- Published:
- Last modified:
Description
AIL did not restrict repeated failed attempts to verify a two-factor authentication (OTP) code. An attacker who had reached the 2FA verification step, such as after successfully completing the password-authentication stage, could submit an unlimited number of OTP guesses. This could enable brute-force guessing of a valid code and bypass the intended second authentication factor, resulting in unauthorized account access. The patch introduces per-user failed-OTP tracking, blocks verification after 30 failed attempts for one hour, clears the counter after a successful OTP verification, and provides administrator recovery actions to purge affected lockouts.
Frequently asked questions
- What is CVE-2026-56450?
- AIL did not restrict repeated failed attempts to verify a two-factor authentication (OTP) code. An attacker who had reached the 2FA verification step, such as after successfully completing the password-authentication stage, could submit an unlimited number of OTP guesses. This could enable brute-force guessing of a valid code and bypass the intended second authentication factor, resulting in unauthorized account access. The patch introduces per-user failed-OTP tracking, blocks verification after 30 failed attempts for one hour, clears the counter after a successful OTP verification, and provides administrator recovery actions to purge affected lockouts.
- How severe is CVE-2026-56450?
- CVE-2026-56450 has a CVSS 4.0 base score of 5.1, rated medium severity.
- Is CVE-2026-56450 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-56450?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-56450 have an EU (EUVD) identifier?
- Yes. CVE-2026-56450 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38239.
- When was CVE-2026-56450 published?
- CVE-2026-56450 was published on 2026-06-22.
References
Other CWE-307 (Improper Restriction of Excessive Authentication Attempts) vulnerabilities
- CVE-2026-6853 — Critical (CVSS 9.8): Improper restriction of excessive authentication attempts vulnerability in Başbelen Group Food Cafe Businesses…
- CVE-2026-8760 — Critical (CVSS 9.8): The Login with OTP plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including,…
- CVE-2020-37228 — Critical (CVSS 9.8): iDS6 DSSPro Digital Signage System 6.2 contains a CAPTCHA security bypass vulnerability that allows attackers to bypass…
- CVE-2026-33879 — Critical (CVSS 9.8): Federated Learning and Interoperability Platform (FLIP) is an open-source platform for federated training and…
- CVE-2026-33640 — Critical (CVSS 9.8): Outline is a service that allows for collaborative documentation. Outline implements an Email OTP login flow for users…
- CVE-2026-31851 — Critical (CVSS 9.8): Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout…
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