How severe is CVE-2021-27902?

CVE-2021-27902 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27902 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27902?

CVE-2021-27902 affects Craftcms Craft Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27902?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-27902 published?

CVE-2021-27902 was published on 2021-06-30 and last updated on 2026-06-17.

CVE-2021-27902

CVE-2021-27902 is a medium-severity vulnerability in Craftcms Craft Cms with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Craftcms Craft Cms
Published: 2021-06-30
Last modified: 2026-06-17

Description

An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.

Frequently asked questions

What is CVE-2021-27902?: An issue was discovered in Craft CMS before 3.6.0. In some circumstances, a potential XSS vulnerability existed in connection with front-end forms that accepted user uploads.
How severe is CVE-2021-27902?: CVE-2021-27902 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27902 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27902?: CVE-2021-27902 affects Craftcms Craft Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27902?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27902 published?: CVE-2021-27902 was published on 2021-06-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*

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