Prefect Auth Bypass via endswith() Health Check Exemption
Published May 4, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
Prefect Auth Bypass via endswith() Health Check Exemption
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
A vulnerability was detected in PrefectHQ prefect up to 3.6.21. This impacts the function endswith of the file /api/health of the component Health Check API. Performing a manipulation results in improper authentication. The attack is possible to be carried out remotely. The exploit is now public and may be used. Upgrading to version 3.6.22 will fix this issue. Upgrading the affected component is recommended.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- gist.github.com ↗
- Source repository ↗
- Patch commit ↗
- Source repository ↗
- Source repository ↗
- vuldb.com ↗
- vuldb.com ↗
- vuldb.com ↗
Record history
Published May 4, 2026 · Last refreshed Nov 3, 2026