Timing-Based Username Enumeration Vulnerability in Fides Webserver Authentication

Exploitation

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

CVSS

not scored

EPSS

• CVE-2024-45052: 0.56% estimated exploitation activity in the next 30 days; percentile 46.45 (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.

A timing-based username enumeration vulnerability has been identified in Fides Webserver authentication. This vulnerability allows an unauthenticated attacker to determine the existence of valid usernames by analyzing the time it takes for the server to respond to login requests. The discrepancy in response times between valid and invalid usernames can be leveraged to enumerate users on the system. Impact This vulnerability enables a timing-based username enumeration attack. An attacker can systematically guess and verify which usernames are valid by measuring the server's response time to authentication requests. This information can be used to conduct further attacks on authentication such as password brute-forcing and credential stuffing. Patches The vulnerability has been patched in Fides version 2.44.0. Users are advised to upgrade to this version or later to secure their systems against this threat. Workarounds There are no workarounds. Proof of Concept 1. Create a valid user…

Published by the source

4 Sep 2024, 18:03 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 13:16 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2h46-8gf5-fmxv

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-2h46-8gf5-fmxv

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# Patch Next advisory brief: CVE-2024-45052

Advisory: Timing-Based Username Enumeration Vulnerability in Fides Webserver Authentication
IDs: CVE-2024-45052, GHSA-2h46-8gf5-fmxv
Record: https://patchnext.com/advisories/cve-2024-45052 (revision 2, source checked 26 Oct 2026, 13:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ethyca-fides 2.44.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI ethyca-fides: affected < 2.44.0; fixed in 2.44.0

## Suggested inspection (read-only)
- `python -m pip show ethyca-fides`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ethyca-fides.
- 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-2h46-8gf5-fmxv (OSV record GHSA-2h46-8gf5-fmxv lists affected ranges: PyPI ethyca-fides >=0 <2.44.0 (fixed))
- Verified: https://github.com/advisories/GHSA-2h46-8gf5-fmxv (GitHub-reviewed advisory GHSA-2h46-8gf5-fmxv lists affected ranges: PyPI ethyca-fides >=0 <2.44.0)

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