What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-16
• Weakness: CWE-352

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.

Affected products

• mher flower: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: mher flower 2.2.0. Check the vendor advisory for mitigations.

References

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

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