What is CVE-2021-32561?

CVE-2021-32561 is a medium-severity vulnerability in Octoprint, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-11.

How severe is CVE-2021-32561?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Octoprint

CVE-2021-32561

OctoPrint before 1.6.0 allows XSS because API error messages include the values of input parameters.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (65.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Octoprint

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

octoprint.org/blog/2021/04/27/new-release-1.6.0/ (Third Party Advisory, Release Notes)
github.com/OctoPrint/OctoPrint/releases/tag/1.6.0 (Third Party Advisory, Release Notes)
www.brzozowski.io/web-applications/2021/05/11/the-insecure-story-of-octoprint.h… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-32561?: CVE-2021-32561 is a medium-severity vulnerability in Octoprint, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-11.
How severe is CVE-2021-32561?: Medium severity. CVSS v3 base score is 6.1 out of 10.