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CVE-2026-7724— PrefectHQ prefect Webhook/Notification validate_restricted_url toctou

Quick assessment

Affected
PrefectHQ prefect
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Prefect是Prefect开源的一款工作流编排工具，使开发人员能够构建、观察数据管道并对数据管道做出反应。 Prefect 3.6.28.dev1及之前版本存在竞争条件问题漏洞，该漏洞源于Webhook/Notification组件的函数validate_restricted_url存在检查时间与使用时间问题，攻击者可通过远程发起攻击。

CVSS 5.0 · Medium EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
PrefectHQ prefect 3.6.28.dev1 affected
3.6.28.dev2 unaffected
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I. Basic Information for CVE-2026-7724

Vulnerability Information
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Vulnerability Title
PrefectHQ prefect Webhook/Notification validate_restricted_url toctou
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in PrefectHQ prefect up to 3.6.28.dev1. Affected by this vulnerability is the function validate_restricted_url of the component Webhook/Notification. The manipulation leads to time-of-check time-of-use. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.6.28.dev2 addresses this issue. The identifier of the patch is 7c70ac54a5e101431d83b9f2681ec88d5e0021ed. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Prefect 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prefect是Prefect开源的一款工作流编排工具，使开发人员能够构建、观察数据管道并对数据管道做出反应。 Prefect 3.6.28.dev1及之前版本存在竞争条件问题漏洞，该漏洞源于Webhook/Notification组件的函数validate_restricted_url存在检查时间与使用时间问题，攻击者可通过远程发起攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PrefectHQ prefect 3.6.28.dev1 cpe:2.3:a:prefect:prefect:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7724

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III. Intelligence Information for CVE-2026-7724

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Patches & Fixes for CVE-2026-7724 (2)

Vendor Pages for CVE-2026-7724 (1)

Other References for CVE-2026-7724 (2)

Same Patch Batch · PrefectHQ · 2026-05-04 · 4 CVEs total

CVE-2026-7723 7.3 HIGH PrefectHQ prefect WebSocket Endpoint in missing authentication
CVE-2026-7725 6.3 MEDIUM PrefectHQ prefect GitRepository Pull storage.py argument injection
CVE-2026-7722 5.3 MEDIUM PrefectHQ prefect Health Check API health endswith improper authentication

IV. Related Vulnerabilities

Same product: prefect
Same vendor: PrefectHQ
Same weakness: CWE-367

V. Comments for CVE-2026-7724

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