CVE-2021-32091

Cross-site scripting in LocalStack

6.1 MediumFix available

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

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

0.85%Up 0.2 points since May 7, 2021

What each source reports

NVD Score used 6.1

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

Record: CVE-2021-32091
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

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

Record: CVE-2021-32091
Updated: 2026-11-02

EUVDEUVD-2021-0114 No score

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

Record: EUVD-2021-0114
Updated: 2026-11-03

GitHub AdvisoriesGHSA-37m5-42qp-4qpr 5.3

Cross-site scripting in LocalStack

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack.

Record: GHSA-37m5-42qp-4qpr
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

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

Record: CVE-2021-32091
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-37m5-42qp-4qpr 5.3

Cross-site scripting in LocalStack

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack.

Record: GHSA-37m5-42qp-4qpr
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-2021-102 No score

A Cross-site scripting (XSS) vulnerability exists in StackLift LocalStack 0.12.6.

Record: PYSEC-2021-102
Updated: 2026-11-02

Affected products

localstack

Affected packages

Affected packages
Package	Affected	Fixed
`localstack` PyPI	through 0.12.10	None known
`localstack` PyPI	through 0.12.10, plus listed versions 0.0.10.1.100.1.110.1.120.1.13 Show 45 moreShow less 0.1.140.1.150.1.170.1.180.1.50.1.60.1.70.1.80.1.90.10.00.10.10.10.1.10.10.1.20.10.1.30.10.1.40.10.20.10.2.10.10.2.20.10.2.30.10.2.40.10.2.50.10.30.10.3.10.10.3.20.10.40.10.4.10.10.4.20.10.50.10.60.10.70.10.80.11.00.11.0.10.11.0.20.11.0.30.11.0.40.11.0.50.11.10.11.1.10.11.20.11.30.11.3.10.11.3.20.11.3.30.11.4	None known
`localstack` PyPI	before 0.12.6.1, plus listed versions 0.0.10.1.100.1.110.1.120.1.13 Show 45 moreShow less 0.1.140.1.150.1.170.1.180.1.50.1.60.1.70.1.80.1.90.10.00.10.10.10.1.10.10.1.20.10.1.30.10.1.40.10.20.10.2.10.10.2.20.10.2.30.10.2.40.10.2.50.10.30.10.3.10.10.3.20.10.40.10.4.10.10.4.20.10.50.10.60.10.70.10.80.11.00.11.0.10.11.0.20.11.0.30.11.0.40.11.0.50.11.10.11.1.10.11.20.11.30.11.3.10.11.3.20.11.3.30.11.4	0.12.6.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-32091 is a medium vulnerability (CVSS 6.1) in Localstack, published May 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. Fixed in localstack 0.12.6.1.

References

This page doesn't list everything

Left out here: 161 versions. The JSON record has them.