CVE-2026-32602: Homarr has a Race Condition in Invite Token Registration (TOCTOU)

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-06 · updated 2026-06-17
Weakness: CWE-367

Description

Homarr is an open-source dashboard. Prior to 1.57.0, the user registration endpoint (/api/trpc/user.register) is vulnerable to a race condition that allows an attacker to create multiple user accounts from a single-use invite token. The registration flow performs three sequential database operations without a transaction: CHECK, CREATE, and DELETE. Because these operations are not atomic, concurrent requests can all pass the validation step (1) before any of them reaches the deletion step (3). This allows multiple accounts to be registered using a single invite token that was intended to be single-use. This vulnerability is fixed in 1.57.0.

Affected products

homarr-labs homarr: before 1.57.0 — fixed in 1.57.0

How to fix

Upgrade to a fixed version: homarr-labs homarr 1.57.0. Check the vendor advisory for mitigations.

References

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