---
id: CVE-2026-103396
title: >-
  bbs-go through 4.4.6 contains a permission bypass vulnerability in the
  AdminMiddleware authorization logic where the read-only dashboard.user.view
  permission rule matches the /api/admin/user/synccount endpoint before the
  intended dashboa…
summary: >-
  bbs-go through 4.4.6 contains a permission bypass vulnerability in the
  AdminMiddleware authorization logic where the read-only dashboard.user.view
  permission rule matches the /api/admin/user/synccount endpoint before the
  intended dashboa…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-863
vendor: mlogclub
product: bbs-go
affected:
  - bbs-go <= 4.4.6
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T15:22:28.093'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103396'
references:
  - url: 'https://github.com/mlogclub/bbs-go'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/admin/user_handlers.go#L47-L59
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/permissions/admin_permission_registry.go#L59-L60
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mlogclub/bbs-go/commit/97d0bb3dcbacd686fd5300295afbf4f4a5da7609
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mlogclub/bbs-go/issues/303'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-incorrect-authorization-via-api-admin-user-synccount
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T15:07:05.378Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T16:57:45.943159Z'
---

## Overview

bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.

## Remediation

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