Auth bypass in L429609201 Misaka Danmu Server
CVE-2026-111643
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/misaka-danmu-server-ui-api-missing-authentication (third-party-advisory)
- github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/api/ui/config_history… (technical-description)
- github.com/l429609201/misaka_danmu_server/blob/v2.8.9/src/security.py (technical-description)
- www.vulncheck.com/advisories/misaka-danmu-server-through-2.8.9-authentication-b… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111643?
- CVE-2026-111643 is a critical-severity vulnerability in L429609201 Misaka Danmu Server, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-16.
- How severe is CVE-2026-111643?
- Critical severity. CVSS v3 base score is 9.8 out of 10.