CVE-2026-7724
MEDIUMPrefectHQ prefect Webhook/Notification validate_restricted_url toctou
Title source: cnaDescription
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.
References (9)
Core 9
Core References
Vdb Entry, Technical Description vdb-entry
technical-description
VDB-360900 | PrefectHQ prefect Webhook/Notification validate_restricted_url toctou
https://vuldb.com/vuln/360900
Signature, Permissions Required signature
permissions-required
VDB-360900 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/vuln/360900/cti
Third Party Advisory third-party-advisory
Submit #807303 | PerfectHQ Perfect >=3.6.26 Time-of-check Time-of-use
https://vuldb.com/submit/807303
Issue Tracking issue-tracking
https://linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-restricted-url
Patch issue-tracking
patch
https://github.com/PrefectHQ/prefect/pull/21591
Exploit exploit
https://gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a
Product product
https://github.com/PrefectHQ/prefect/
Scores
CVSS v3
5.0
EPSS
0.0007
EPSS Percentile
22.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-362
CWE-367
Status
published
Products (2)
PrefectHQ/prefect
3.6.28.dev1
PrefectHQ/prefect
3.6.28.dev2
Published
May 04, 2026
Tracked Since
May 04, 2026