What is CVE-2024-33661?

CVE-2024-33661 is a critical-severity vulnerability in Portainer, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.1/10. Published 2024-04-26.

How severe is CVE-2024-33661?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Open Redirect in Portainer

CVE-2024-33661

Portainer before 2.20.0 allows redirects when the target is not index.yaml.

Vulnerability class: Open Redirect

Published 2024-04-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Portainer

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

www.portainer.io/ (Product)
github.com/portainer/portainer/pull/11236 (Patch)
github.com/portainer/portainer/pull/11233 (Patch)
github.com/portainer/portainer/compare/2.19.4...2.20.0 (Product)

Frequently asked questions

What is CVE-2024-33661?: CVE-2024-33661 is a critical-severity vulnerability in Portainer, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.1/10. Published 2024-04-26.
How severe is CVE-2024-33661?: Critical severity. CVSS v3 base score is 9.1 out of 10.