CVE-2026-34072

Unauthenticated server-action execution via fail-open middleware

Published Apr 1, 2026 · Updated Apr 1, 2026

Authentication bypass in fccview CronMaster before 2.2.0 allows remote attackers to invoke privileged server actions without a valid session. The proxy.ts middleware catches failures from its internal /api/auth/check-session fetch and continues with NextResponse.next() instead of denying the request. Network access and conditions that make the session check fail are required; an invalid cookie then exposes protected pages and privileged operations.

CVSS severity8.3
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in fccview CronMaster before 2.2.0 allows remote attackers to invoke privileged server actions without a valid session. The proxy.ts middleware catches failures from its internal /api/auth/check-session fetch and continues with NextResponse.next() instead of denying the request. Network access and conditions that make the session check fail are required; an invalid cookie then exposes protected pages and privileged operations.

The record

CVE
CVE-2026-34072
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
fccview
Product
CronMaster
Classifications
CWE-306, CWE-287, CWE-693, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.2.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

fccview · CronMasterversion=< 2.2.0

Published CVSS scores

8.3GitHubCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-287Improper Authentication
CWE-693Protection Mechanism Failure
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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