vercel flags up to 3.x information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in vercel flags up to 3.x. This vulnerability affects unknown code. This manipulation causes information disclosure. This vulnerability is registered as CVE-2025-46332. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in vercel flags up to 3.x and classified as problematic. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

Flags SDK is an open-source feature flags toolkit for Next.js and SvelteKit. Impacted versions include flags from 3.2.0 and prior and @vercel/flags from 3.1.1 and prior as certain circumstances allows a bad actor with detailed knowledge of the vulnerability to list all flags returned by the flags discovery endpoint (.well-known/vercel/flags). This vulnerability allows for information disclosure, where a bad actor could gain access to a list of all feature flags exposed through the flags discovery endpoint, including the flag names, flag descriptions, available options and their labels (e.g. true, false), and default flag values. This issue has been patched in [email protected], users of flags and @vercel/flags should also migrate to [email protected].

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-46332 since 04/23/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 4.0.0 eliminates this vulnerability. The upgrade is hosted for download at vercel.com.

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Productinfo

Vendor

• vercel

Name

• flags

Version

• 3.x

Website

• Product: https://github.com/vercel/flags/

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CPE 2.2info

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