Privilege Escalation via Improper Input Validation in mintplex-labs/anything-llm

Vulnerability Description

In mintplex-labs/anything-llm, an improper input validation vulnerability allows attackers to escalate privileges by deactivating 'Multi-User Mode'. By sending a specially crafted curl request with the 'multi_user_mode' parameter set to false, an attacker can deactivate 'Multi-User Mode'. This action permits the creation of a new admin user without requiring a password, leading to unauthorized administrative access.

References

• https://huntr.com/bounties/c114c03e-3348-450f-88f7-538502047bcc
• https://github.com/mintplex-labs/anything-llm/commit/52fac844221a9b951d08ceb93c4c014e9397b1f2