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CVE-2026-7723: PrefectHQ prefect WebSocket Endpoint in missing authentication

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-04 · updated 2026-10-26
• Weakness: CWE-287

Description

A flaw has been found in PrefectHQ prefect up to 3.6.13. Affected is an unknown function of the file /api/events/in of the component WebSocket Endpoint. Executing a manipulation can lead to missing authentication. The attack may be performed from remote. The exploit has been published and may be used. Upgrading to version 3.6.14 is able to address this issue. This patch is called f8afecadf88ea5f73694dafa3a365b9d8fae1ad6. It is recommended to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Affected products

• prefecthq/prefect: 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.6.4, 3.6.5 (+8)

References

• https://gist.github.com/nedlir/f1ab8aa038aafbcc6beeef21fab1d74f
• https://github.com/PrefectHQ/prefect/
• https://github.com/PrefectHQ/prefect/commit/f8afecadf88ea5f73694dafa3a365b9d8fae1ad6
• https://github.com/PrefectHQ/prefect/pull/20372
• https://github.com/PrefectHQ/prefect/releases/tag/3.6.14
• https://vuldb.com/submit/807256
• https://vuldb.com/vuln/360899
• https://vuldb.com/vuln/360899/cti

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