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🐍 PyPI
Not in CISA KEV
MEDIUM severity

OctoPrint API Error Messages vulnerable to XSSGHSA-vcx4-fpmp-mvv6

MEDIUM

GHSA-vcx4-fpmp-mvv6 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in octoprint. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for octoprint — see the affected versions and patch details below.

Also known asCVE-2021-32561PYSEC-2021-30
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk-0.00%
Lower risk than most CVEs67th percentile — riskier than 67% of all scored CVEsHighest risk
0.00%0.55%1.10%1.65%0.3%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍octoprint

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIoctoprintall versions1.6.0pip install --upgrade 'octoprint==1.6.0'

Affected Products

1 product · 1 configurations
Application
octoprintoctoprint
< 1.6.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

OctoPrint before 1.6.0 allows XSS because API error messages include the…

brzozowski.ioNVDMay 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for octoprint, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update octoprint to 1.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vcx4-fpmp-mvv6 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

OctoPrint before 1.6.0 allows XSS because API error messages include the values of input parameters.
O3 Security · Impact-Aware SCA

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OctoPrint API Error Messages vulnerable to XSS