Authentication bypass via unchecked OAuth emailVerified
Published Aug 18, 2026 · Updated Aug 18, 2026
Improper authentication in Localhost Labs Ltd Karakeep 0.26.0 through 0.32.0 allows remote attackers to obtain a session via OAuth sign-in. In apps/web/server/auth.ts, the NextAuth callbacks.signIn() logic enforces EMAIL_VERIFICATION_REQUIRED only inside the credentials branch, then returns success on the OAuth branch without checking user.emailVerified. Exposure requires a deployment with EMAIL_VERIFICATION_REQUIRED enabled and an OAuth or OIDC provider configured; providers that accept unverified email claims let attackers bypass the intended verification gate.
Summary
What happened
Improper authentication in Localhost Labs Ltd Karakeep 0.26.0 through 0.32.0 allows remote attackers to obtain a session via OAuth sign-in. In apps/web/server/auth.ts, the NextAuth callbacks.signIn() logic enforces EMAIL_VERIFICATION_REQUIRED only inside the credentials branch, then returns success on the OAuth branch without checking user.emailVerified. Exposure requires a deployment with EMAIL_VERIFICATION_REQUIRED enabled and an OAuth or OIDC provider configured; providers that accept unverified email claims let attackers bypass the intended verification gate.
The record
- CVE
- CVE-2026-75774
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Vendor
- Localhost Labs Ltd
- Product
- Karakeep
- Classifications
- CWE-287, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.1
- Affected versionversion=0.10
- Affected versionversion=0.11
- Affected versionversion=0.12
- Affected versionversion=0.13
- Affected versionversion=0.14
- Affected versionversion=0.15
- Affected versionversion=0.16
- Affected versionversion=0.17
- Affected versionversion=0.18
- Affected versionversion=0.19
- Affected versionversion=0.2
- Affected versionversion=0.20
- Affected versionversion=0.21
- Affected versionversion=0.22
- Affected versionversion=0.23
- Affected versionversion=0.24
- Affected versionversion=0.25
- Affected versionversion=0.26
- Affected versionversion=0.27
- Affected versionversion=0.28
- Affected versionversion=0.29
- Affected versionversion=0.3
- Affected versionversion=0.30
- Affected versionversion=0.31
- Affected versionversion=0.32.0
- Affected versionversion=0.4
- Affected versionversion=0.5
- Affected versionversion=0.6
- Affected versionversion=0.7
- Affected versionversion=0.8
- Affected versionversion=0.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- OAuth Sign-In Bypasses Mandatory Email Verification proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo