CVE-2026-90938 LangBot langbot_plugin - Authentication Bypass

LangBot langbot_plugin <= 0.4.17 contains an authentication bypass caused by default empty plugin_debug_key on debug WebSocket server, letting remote attackers register debug plugins and access sensitive IM events, exploit requires network access to port 5401.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Information Disclosure, Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-306

Vendor fix

Update to the latest version once a patch is available.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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