CVE-2026-67345
HIGHDescription
MaxKey through 4.1.12, fixed in commit ddbb72f, contains an insufficient redirect URI validation vulnerability in DefaultRedirectResolver.hostMatches() that allows remote attackers to hijack OAuth 2.0 authorization codes by supplying a crafted redirect_uri whose hostname suffix matches a registered URI without proper dot-boundary anchoring. Attackers who control a domain ending with the registered redirect URI hostname can social-engineer victims into clicking a crafted authorization URL, causing the authorization code to be issued to the attacker-controlled URI and exchanged for an access token granting access to the victim's identity.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 23% of all known CVEs.
References
Related Vulnerabilities
Other CWE-183 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-25696 | High | 7.5 | 2.6% | - | Fix |
| CVE-2026-21915 | Medium | 6.7 | 2.2% | - | Fix |
| CVE-2020-1694 | Medium | 4.9 | 1.6% | - | Fix |
| CVE-2024-1654 | High | 7.2 | 1.3% | - | Fix |
| CVE-2023-4399 | Medium | 6.6 | 1.1% | - | Fix |
| CVE-2021-34787 | Medium | 5.3 | 1.0% | - | Fix |
Common questions
How do I fix CVE-2026-67345?
No published fix for CVE-2026-67345 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-67345 being actively exploited?
Not that we know of. CVE-2026-67345 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.
How severe is CVE-2026-67345?
CVE-2026-67345 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-30.