Vulnerability in Yincongcyincong Musebot
CVE-2026-119660
MuseBot before 2.0.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge admin sessions by using the hard-coded default session_key 'muse_bot_session_key'. Attackers can sign a MuseBot-session cookie carrying a user_id to gain full administrative access, reading password hashes, chat records, and bot configuration, and stopping bots.
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
- github.com/yincongcyincong/MuseBot/issues/61 (issue-tracking)
- github.com/yincongcyincong/MuseBot/commit/3e64518948fe7037058f07ef987d35216c3f0… (patch)
- github.com/yincongcyincong/MuseBot/commit/139f6158b50283b983d76976f593a3a09a064… (patch)
- github.com/yincongcyincong/MuseBot/blob/v1.0.42/admin/conf/conf.go (technical-description)
- github.com/yincongcyincong/MuseBot/blob/v1.0.42/admin/controller/login.go (technical-description)
- hackmd.io/@hieuPenguinnn/musebot-admin-default-session-key-auth-bypass (third-party-advisory)
- github.com/yincongcyincong/MuseBot (product)
- www.vulncheck.com/advisories/musebot-before-2.0.0-authentication-bypass-via-har… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119660?
- CVE-2026-119660 is a critical-severity vulnerability in Yincongcyincong Musebot, classified under CWE-1394. CVSS score: 9.8/10. Published 2026-10-30.
- How severe is CVE-2026-119660?
- Critical severity. CVSS v3 base score is 9.8 out of 10.