AstrBotDevs AstrBot up to 4.23.5 File Upload chat.py post_file filename path traversal

Summaryinfo

A vulnerability has been found in AstrBotDevs AstrBot up to 4.23.5 and classified as critical. The affected element is the function post_file of the file astrbot/dashboard/routes/chat.py of the component File Upload Handler. This manipulation of the argument filename causes path traversal. This vulnerability is handled as CVE-2026-8754. The attack can be initiated remotely. Additionally, an exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in AstrBotDevs AstrBot up to 4.23.5. It has been declared as critical. Affected by this vulnerability is the function post_file of the file astrbot/dashboard/routes/chat.py of the component File Upload Handler. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at gist.github.com. This vulnerability is known as CVE-2026-8754. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

It is possible to download the exploit at gist.github.com. It is declared as proof-of-concept.

Upgrading to version 4.23.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch aaec41e5054569ceaa1113593a34da7568e2d211 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30700). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• AstrBotDevs

Name

• AstrBot

Version

• 4.23.0
• 4.23.1
• 4.23.2
• 4.23.3
• 4.23.4
• 4.23.5

License

• open-source

Website

• Product: https://github.com/AstrBotDevs/AstrBot/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

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Entryinfo

Submitinfo

Accepted

• Submit #811172: AstrBotDevs AstrBot latest Path Traversal (CWE-22) (by Eric-a)

Duplicate

• Submit #XXXXXX: Xxxxxxxxxxx Xxxxxxx X.xx.x Xxxx Xxxxxxxxx (xxx-xx) (by Eric-a)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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