CVE-2026-34072 cronmaster: Middleware authentication bypass enabling unauthorized page access and server-action execution
Unauthenticated attackers can bypass middleware authentication to access protected pages and execute privileged server actions in CronMaster.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34072?
CVE-2026-34072 is a high-severity authentication bypass vulnerability in fccview cronmaster, published on 1 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-34072?
It affects 1 product.
Products include Fccview Cronmaster.
How do I fix CVE-2026-34072?
No fix has been published for CVE-2026-34072 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-34072 being exploited?
There is no known exploitation of CVE-2026-34072 in the wild and no public exploit code.
Sources
Also known as GHSA-9whh-mffv-xvh6.