---
id: CVE-2026-110103
title: >-
  bbs-go through 4.4.6 contains a stored cross-site scripting vulnerability that
  allows authenticated users to upload HTML or SVG files by spoofing the
  multipart Content-Type in POST /api/upload
summary: >-
  bbs-go through 4.4.6 contains a stored cross-site scripting vulnerability that
  allows authenticated users to upload HTML or SVG files by spoofing the
  multipart Content-Type in POST /api/upload. Attackers can upload
  script-bearing documen…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T17:17:34.150'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110103'
references:
  - url: >-
      https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/api/upload_handlers.go#L36-L54
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/pkg/uploader/uploader.go#L90-L121
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mlogclub/bbs-go/commit/5bebf98bb9e0ac5162d4f8faf7a65fc0d496a362
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mlogclub/bbs-go/issues/305'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mlogclub/bbs-go/pull/306'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-stored-xss-via-image-upload-content-type
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T17:38:53.185Z'
---

## Overview

bbs-go through 4.4.6 contains a stored cross-site scripting vulnerability that allows authenticated users to upload HTML or SVG files by spoofing the multipart Content-Type in POST /api/upload. Attackers can upload script-bearing documents served inline from /res and send their URLs to administrators, executing script on the forum's origin.

## Remediation

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