Information Disclosure via Flags override link

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

• CVE-2025-46332: 0.34% estimated exploitation activity in the next 30 days; percentile 27.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary An information disclosure vulnerability affecting Flags SDK has been addressed. It impacted flags ≤3.2.0 and @vercel/flags ≤3.1.1 and in certain circumstances, allowed a bad actor with detailed knowledge of the vulnerability to list all flags returned by the flags discovery endpoint (.well-known/vercel/flags). Impact This vulnerability allowed 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) - Default flag values Not impacted: - Flags providers were not accessible No write access nor additional customer data was exposed, this is limited to just the values noted above. Vercel has automatically mitigated this incident on behalf of our customers for the default flags discovery endpoint at .well-known/vercel/flags. Flags Explorer will be disabled and show a warning notice until upgraded…

Published by the source

2 May 2025, 19:28 UTC

Last modified by the source

2 May 2025, 19:57 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-892p-pqrr-hxqr

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-892p-pqrr-hxqr

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# Patch Next advisory brief: CVE-2025-46332

Advisory: Information Disclosure via Flags override link
IDs: CVE-2025-46332, GHSA-892p-pqrr-hxqr
Record: https://patchnext.com/advisories/cve-2025-46332 (revision 2, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: flags 4.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm flags: affected <= 3.2.0; fixed in 4.0.0
- npm @vercel/flags: affected <= 3.1.1

## Suggested inspection (read-only)
- `npm ls flags --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @vercel/flags --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on flags, @vercel/flags.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-892p-pqrr-hxqr (OSV record GHSA-892p-pqrr-hxqr lists affected ranges: npm flags >=0 =0 <=3.1.1)
- Verified: https://github.com/advisories/GHSA-892p-pqrr-hxqr (GitHub-reviewed advisory GHSA-892p-pqrr-hxqr lists affected ranges: npm flags >=0 =0 <=3.1.1)

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