How severe is CVE-2021-28956?

CVE-2021-28956 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28956?

CVE-2021-28956 affects Sass Lint Project Sass Lint. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28956 published?

CVE-2021-28956 was published on 2021-03-22 and last updated on 2026-06-17.

CVE-2021-28956

CVE-2021-28956 is a high-severity vulnerability in Sass Lint Project Sass Lint with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Sass Lint Project Sass Lint
Published: 2021-03-22
Last modified: 2026-06-17

Description

The unofficial vscode-sass-lint (aka Sass Lint) extension through 1.0.7 for Visual Studio Code allows attackers to execute arbitrary binaries if the user opens a crafted workspace. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Frequently asked questions

What is CVE-2021-28956?: The unofficial vscode-sass-lint (aka Sass Lint) extension through 1.0.7 for Visual Studio Code allows attackers to execute arbitrary binaries if the user opens a crafted workspace. NOTE: This vulnerability only affects products that are no longer supported by the maintainer
How severe is CVE-2021-28956?: CVE-2021-28956 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28956?: CVE-2021-28956 affects Sass Lint Project Sass Lint. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28956 published?: CVE-2021-28956 was published on 2021-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sass_lint_project:sass_lint:*:*:*:*:*:visual_studio_code:*:*