MuseBot before 2.0.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge
Affects MuseBotSource GCVE Database
Not known to be exploited · CVSS 9.3 Critical : upgrade to 2.0.0 as a priority.
Data as of 30 Oct 2026, 16:37 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 9.3 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 9.8 |
- Patch
- Available – fixed in 2.0.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 30 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade yincongcyincong/MuseBot to 2.0.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
GitHubyincongcyincong/MuseBotpkg:github/yincongcyincong/MuseBotOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fixed version 2.0.0 or later should be used to remediate this vulnerability. Until then, restricting access to MuseBot instances and monitoring for unauthorized access attempts is recommended.
Description
MuseBot versions before 2.0.0 have an authentication bypass vulnerability due to a hard-coded default session key. This flaw allows unauthenticated attackers to forge admin sessions by signing a session cookie with the known default key. Successful exploitation grants full administrative access, including reading password hashes, chat records, bot configuration, and the ability to stop bots.
References
- nvd.nist.gov/vuln/detail/CVE-2026-119660 (opens in a new tab)
- github.com/yincongcyincong/MuseBot/issues/61 (opens in a new tab)
- github.com/yincongcyincong/MuseBot/commit/139f6158b50283b983d76976f593a3a09a064681 (opens in a new tab)
- github.com/yincongcyincong/MuseBot/commit/3e64518948fe7037058f07ef987d35216c3f0cae (opens in a new tab)
- github.com/yincongcyincong/MuseBot (opens in a new tab)
- github.com/yincongcyincong/MuseBot/blob/v1.0.42/admin/conf/conf.go (opens in a new tab)
- github.com/yincongcyincong/MuseBot/blob/v1.0.42/admin/controller/login.go (opens in a new tab)
- hackmd.io/@hieuPenguinnn/musebot-admin-default-session-key-auth-bypass (opens in a new tab)
- vulncheck.com/advisories/musebot-before-2.0.0-authentication-bypass-via-hard-coded-session-key (opens in a new tab)