CVE-2026-67345

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.

Score

CVSS 4.0 8.5 High

Status

Deferred - disclosure@vulncheck.com

Published

2026-07-30

Last modified

2026-10-23

Weaknesses

CWE-183

Affected products

• Maxkey (Maxkey)

References

• https://github.com/dromara/MaxKey/issues/269
• https://github.com/dromara/MaxKey/commit/ddbb72fb24ab8e66aa422fb14b1177330bcffb45
• https://www.vulncheck.com/advisories/maxkey-defaultredirectresolver-oauth-authorization-code-theft