---
id: CVE-2026-111626
title: >-
  Webreaper Damselfly through 4.5.3 Missing Authentication on REST API
  Controllers
summary: >-
  Webreaper Damselfly through 4.5.3 contains an authentication bypass
  vulnerability that allows unauthenticated attackers to access all /api/*
  routes because controller authorization attributes are commented out.
  Attackers can send PUT /ap…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: Webreaper
product: Damselfly
affected:
  - Damselfly <= 4.5.3
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T20:53:24.672344Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T21:19:19.069Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111626'
references:
  - url: 'https://hackmd.io/@hieuPenguinnn/damselfly-api-missing-authorization'
  - url: >-
      https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Controllers/UserManagementController.cs#L8-L53
  - url: >-
      https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Program.cs#L238-L242
  - url: 'https://github.com/Webreaper/Damselfly/issues/409'
  - url: >-
      https://www.vulncheck.com/advisories/webreaper-damselfly-through-4.5.3-missing-authentication-on-rest-api-controllers
    label: >-
      VulnCheck Advisory: Webreaper Damselfly through 4.5.3 Missing
      Authentication on REST API Controllers
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.689Z'
---

## Overview

Webreaper Damselfly through 4.5.3 contains an authentication bypass vulnerability that allows unauthenticated attackers to access all /api/* routes because controller authorization attributes are commented out. Attackers can send PUT /api/users with Admin roles to create administrator accounts, or POST /api/users to reset any user's password, gaining full control.

## Affected

- `Damselfly <= 4.5.3`

## Remediation

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