Medium Logic error exploit reference

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

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.

Published May 4, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulDB

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.3% (30-day exploitation probability)+3
Technical severity (medium)+3
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.31%

ahead of 22% of scored CVEs · Oct 14, 2026

Affects

PrefectHQ

Prefect

CVSS base

5.0

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (PrefectHQ Prefect).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (logic error), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
PrefectHQ	Prefect	version 3.6.28.dev1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

High

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
2.3	CVSS 4.0	Low	—	—	VulDB via CVE Program (cve.org) e CISA ADP
1.3	CVSS 4.0	Low	—	—	cna@vuldb.com via NIST National Vulnerability Database
5.0	CVSS 3.1	Medium	1.6	3.4	cna@vuldb.com via NIST National Vulnerability Database
5.0	CVSS 3.1	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
5.0	CVSS 3.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP
4.6	CVSS 2.0	Medium	3.9	6.4	cna@vuldb.com via NIST National Vulnerability Database
4.6	CVSS 2.0	Medium	—	—	VulDB via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L (score shown at the top: cna@vuldb.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-362 · Race Condition

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.31%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · prefecthq/prefect
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 5.0
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Deferred
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 4, 2026 · VulDB

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

9 on the record

github.com/PrefectHQ/prefect/releases/tag/3.6.28.dev2
patch, NIST National Vulnerability Database
github.com/PrefectHQ/prefect/pull/21591
issue-tracking, patch, NIST National Vulnerability Database
github.com/PrefectHQ/prefect/commit/7c70ac54a5e101431d83b9f2681ec88d5e0021ed
patch, NIST National Vulnerability Database
github.com/PrefectHQ/prefect/
product, NIST National Vulnerability Database
vuldb.com/vuln/360900
vdb-entry, technical-description, NIST National Vulnerability Database
gist.github.com/nedlir/fa99777e8989414585d08c3625bf044a
exploit, NIST National Vulnerability Database
linear.app/prefect/issue/OSS-7874/fix-dns-rebinding-toctou-bypass-in-validate-re
issue-tracking, NIST National Vulnerability Database
vuldb.com/submit/807303
third-party-advisory, NIST National Vulnerability Database
vuldb.com/vuln/360900/cti
signature, permissions-required, NIST National Vulnerability Database

Elsewhere on this site

PrefectHQ
every CVE for this vendor

Logic error
same class

CWE-362
other pages naming this weakness

Related CVEs (same products)

Critical CVE-2026-5366 Prefect GitRepository git argument injection leading to remote code execution Jun 20, 2026
High CVE-2026-3514 Authentication Bypass in prefecthq/prefect Jun 2, 2026
High CVE-2026-3515 Argument Injection in prefecthq/prefect May 24, 2026
Medium CVE-2026-7725 PrefectHQ prefect GitRepository Pull storage.py argument injection May 4, 2026
High CVE-2026-7723 PrefectHQ prefect WebSocket Endpoint in missing authentication May 4, 2026
Medium CVE-2026-7722 PrefectHQ prefect Health Check API health endswith improper authentication May 4, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-7724 is "PrefectHQ prefect Webhook/Notification validate_restricted_url toctou", rated Medium. It affects Prefect (PrefectHQ); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.0 describes technical severity. EPSS 0.31% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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