Authentication Bypass in AstrBot by AstrBotDevs API Component
CVE-2026-16076

5.3MEDIUM

Key Information:

Vendor

Astrbotdevs

Status
Astrbot
Vendor
CVE Published:
18 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16076?

A vulnerability exists in the AstrBot API, specifically within the OpenApiRoute.chat_send function. By manipulating the Username parameter, an attacker can bypass authentication, enabling unauthorized access to the system. This flaw is remotely exploitable, posing a significant risk to users. Despite early warnings to the vendor, no response has been documented regarding this critical issue, allowing it to remain publicly disclosed and accessible for potential exploitation.

Affected Version(s)

AstrBot 4.25.0

AstrBot 4.25.1

AstrBot 4.25.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16076 - Proof of Concept

References

https://vuldb.com/vuln/379791
vdb-entrytechnical-description
https://vuldb.com/vuln/379791/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-16076
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-d (VulDB User)
VulDB CNA Team
.