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CVE-2021-32561

OctoPrint API Error Messages vulnerable to XSS

6.1 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

1.15%Up 0.3 points since May 12, 2021
90%50%10%1%

What each source reports

NVD Score used 6.1

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

Record
CVE-2021-32561
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
CVE List No score

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

Record
CVE-2021-32561
Updated
2026-11-02
EUVDEUVD-2021-0155 No score

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

Record
EUVD-2021-0155
Updated
2026-11-03
GitHub AdvisoriesGHSA-vcx4-fpmp-mvv6 5.3

OctoPrint API Error Messages vulnerable to XSS

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

Record
GHSA-vcx4-fpmp-mvv6
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 6.1

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

Record
CVE-2021-32561
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-vcx4-fpmp-mvv6 5.3

OctoPrint API Error Messages vulnerable to XSS

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

Record
GHSA-vcx4-fpmp-mvv6
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVPYSEC-2021-30 No score

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

Record
PYSEC-2021-30
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
octoprint
PyPI
 before 1.6.0
1.6.0
octoprint
PyPI
 before 1.6.0, plus listed versions
1.3.111.3.121.3.12rc11.3.12rc31.4.0
Show 22 moreShow less
1.4.0rc11.4.0rc21.4.0rc31.4.0rc41.4.0rc51.4.0rc61.4.11.4.1rc11.4.1rc21.4.1rc31.4.1rc41.4.21.5.01.5.0rc11.5.0rc21.5.0rc31.5.11.5.21.5.31.6.0rc11.6.0rc21.6.0rc3
1.6.0

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-32561 is a medium vulnerability (CVSS 6.1) in Octoprint, published May 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.15%, the 67th percentile. Fixed in octoprint 1.6.0.

References

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