---
id: CVE-2026-115333
title: >-
  Lotus through 0.10.2 Improper Authentication via Event Ingestion API Key
  Prefix
summary: >-
  Lotus through 0.10.2 contains an improper authentication vulnerability in the
  Go event ingestion middleware that validates API keys by prefix only, without
  checking the secret against the stored hashed_key. Attackers who know or
  obtain a…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-287
vendor: uselotus
product: lotus
affected:
  - lotus <= 0.10.2
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T10:57:49.499Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115333'
references:
  - url: 'https://hackmd.io/@leediay/BkUc3WL2Mx'
  - url: >-
      https://github.com/uselotus/lotus/blob/0.10.2/go/event-ingestion/authn/authn.go#L85-L95
  - url: 'https://github.com/uselotus/lotus'
  - url: >-
      https://www.vulncheck.com/advisories/lotus-through-0.10.2-improper-authentication-via-event-ingestion-api-key-prefix
    label: >-
      VulnCheck Advisory: Lotus through 0.10.2 Improper Authentication via Event
      Ingestion API Key Prefix
tags:
  - cve.org
ingestedAt: '2026-10-22T11:37:02.331Z'
---

## Overview

Lotus through 0.10.2 contains an improper authentication vulnerability in the Go event ingestion middleware that validates API keys by prefix only, without checking the secret against the stored hashed_key. Attackers who know or obtain an API key prefix can submit usage events to POST /api/track/ as that organization, altering its metered usage and billing.

## Affected

- `lotus <= 0.10.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.