coaidev CoAI up to 4.0.0 Download Endpoint hash path traversal

Summaryinfo

A vulnerability was found in coaidev CoAI up to 4.0.0. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Download Endpoint. Executing a manipulation of the argument hash can lead to path traversal. This vulnerability appears as CVE-2026-111618. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in coaidev CoAI up to 4.0.0. It has been declared as problematic. This vulnerability affects some unknown processing of the component Download Endpoint. The manipulation of the argument hash 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. CVE summarizes:

CoAI (Chat Nio) through 4.0.0 contains an unauthenticated path traversal vulnerability in the generation and article archive download endpoints via the hash query parameter. Attackers can supply ../ sequences in hash to download any readable .tar.gz or .zip file, including other users' generated archives.

The advisory is available at hackmd.io. This vulnerability was named CVE-2026-111618 since 10/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/16/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• coaidev

Name

• CoAI

Version

• 4.0

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

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