---
id: CVE-2022-51020
title: >-
  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
summary: >-
  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/wor…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - CWE-352
vendor: mher
product: flower
affected:
  - flower < 2.2.0
published: '2026-10-12'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:25:45.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-51020'
references:
  - url: 'https://github.com/mher/flower'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mher/flower/blob/v2.1.0/flower/api/control.py#L25-L27'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mher/flower/commit/3b2115af7f9c42bd2da2fbcbd919f77013e9ec51
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/mher/flower/commit/a14408b16cc3d2877d36659005ce0d72b6162629
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mher/flower/issues/1217'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flower-before-2.2.0-csrf-via-worker-and-task-control-api-endpoints
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00144
epssPercentile: 0.03696
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T13:49:35.993557Z'
ingestedAt: '2026-10-12T22:05:40.350Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.