Vesoft NebulaGraph up to 3.8.0 Web Service WebService.cpp improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in Vesoft NebulaGraph up to 3.8.0. This impacts an unknown function of the file src/webservice/WebService.cpp of the component Web Service. Such manipulation leads to improper authorization. This vulnerability is listed as CVE-2026-81032. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Vesoft NebulaGraph up to 3.8.0 and classified as critical. Affected by this issue is an unknown part of the file src/webservice/WebService.cpp of the component Web Service. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

NebulaGraph exposes its runtime configuration over an unauthenticated HTTP service. Each daemon starts the web service defined in src/webservice/WebService.cpp, whose bind address defaults to all interfaces, and registers routes for reading and writing gflags alongside status and statistics. Neither the service nor its router carries any authentication, token check or address restriction. The read route returns the daemon's full set of runtime flag values, which includes the configured certificate, key and certificate-authority paths, the password file path, data directories and the transport-security enable flags. The write route parses a supplied map and applies each entry through the gflags runtime setter, so a caller able to reach the port can change the daemon's behaviour without restarting it, including disabling the transport-security flags, redirecting log files and altering flags such as failed_login_attempts and password_lock_time_in_secs. Public reports of this endpoint describe a single name, enable_authorize, being refused by the handler; at release 3.8.0 that refusal is not present and the handler applies every name it is given.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-81032 since 08/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/26/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

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

• Vesoft

Name

• NebulaGraph

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8.0

CPE 2.3info

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CPE 2.2info

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