CVE-2026-16076 AstrBotDevs CVE debrief

Who should care

Users of AstrBotDevs AstrBot up to 4.25.5 should be aware of this authentication bypass by spoofing vulnerability and take necessary actions to secure their systems. Operators, administrators, and security teams should review the vulnerability details and implement compensating controls if necessary.

Technical summary

The vulnerability affects the OpenApiRoute.chat_send function in the astrbot/dashboard/routes/open_api.py file of the AstrBot API component. The issue allows for authentication bypass by spoofing through manipulation of the Username argument. The attack can be launched remotely. The CVSS score of 2.1 indicates a low severity vulnerability. Users of AstrBotDevs AstrBot up to 4.25.5 should review the vulnerability details and implement compensating controls if necessary. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way. Evidence is limited to public sources and vendor statements.

Defensive priority

Low priority due to CVSS score of 2.1. However, defenders should still take necessary actions to secure their systems and review vendor guidance for remediation.

Recommended defensive actions

• Verify and apply vendor remediation if available.
• Implement compensating controls such as monitoring and exception tracking.
• Conduct inventory checks to identify affected systems.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way. Evidence is limited to public sources and vendor statements. Defenders should verify affected systems and review vendor guidance for remediation.

Official resources