What’s Vulnerable › Vulnerabilities

CVE-2026-34072: cronmaster: Middleware authentication bypass enabling unauthorized page access and server-action execution

• Severity: critical (CVSS 9.8 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: 2026-04-01 · updated 2026-10-26
• Weakness: CWE-287

Description

Cr*nMaster (cronmaster) is a Cronjob management UI with human readable syntax, live logging and log history for cronjobs. Prior to version 2.2.0, an authentication bypass in middleware allows unauthenticated requests with an invalid session cookie to be treated as authenticated when the middleware’s session-validation fetch fails. This can result in unauthorized access to protected pages and unauthorized execution of privileged Next.js Server Actions. This issue has been patched in version 2.2.0.

Affected products

• fccview cronmaster: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: fccview cronmaster 2.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/fccview/cronmaster/releases/tag/2.2.0
• https://github.com/fccview/cronmaster/security/advisories/GHSA-9whh-mffv-xvh6

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