---
id: CVE-2026-111643
title: >-
  Misaka Danmu Server through 2.8.9 Authentication Bypass via Config-History
  Rollback
summary: >-
  Misaka Danmu Server through 2.8.9 contains an authentication bypass
  vulnerability that allows unauthenticated attackers to write arbitrary
  configuration keys via the unprotected POST /api/ui/config-history/rollback
  endpoint. Attackers ca…
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: l429609201
product: misaka_danmu_server
affected:
  - misaka_danmu_server <= 2.8.9
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:39:13.043Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111643'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/misaka-danmu-server-ui-api-missing-authentication
  - url: >-
      https://github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/api/ui/config_history.py#L51-L66
  - url: >-
      https://github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/security.py#L136-L182
  - url: >-
      https://www.vulncheck.com/advisories/misaka-danmu-server-through-2.8.9-authentication-bypass-via-config-history-rollback
    label: >-
      VulnCheck Advisory: Misaka Danmu Server through 2.8.9 Authentication
      Bypass via Config-History Rollback
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.680Z'
---

## Overview

Misaka Danmu Server through 2.8.9 contains an authentication bypass vulnerability that allows unauthenticated attackers to write arbitrary configuration keys via the unprotected POST /api/ui/config-history/rollback endpoint. Attackers can set the ipWhitelist key to their own /32 address, or alter trustedProxies and webhookApiKey, to access every protected endpoint as the administrator.

## Affected

- `misaka_danmu_server <= 2.8.9`

## Remediation

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