How severe is CVE-2021-28290?

CVE-2021-28290 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-2021-28290 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28290?

CVE-2021-28290 affects Identityserver4.admin Project Identityserver4.admin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28290?

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

When was CVE-2021-28290 published?

CVE-2021-28290 was published on 2022-05-11 and last updated on 2026-06-17.

CVE-2021-28290

CVE-2021-28290 is a medium-severity vulnerability in Identityserver4.admin Project Identityserver4.admin 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% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Identityserver4.admin Project Identityserver4.admin
Published: 2022-05-11
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value passed to the data-secret-value parameter.

Frequently asked questions

What is CVE-2021-28290?: A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value passed to the data-secret-value parameter.
How severe is CVE-2021-28290?: CVE-2021-28290 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-2021-28290 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28290?: CVE-2021-28290 affects Identityserver4.admin Project Identityserver4.admin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28290?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28290 published?: CVE-2021-28290 was published on 2022-05-11 and last updated on 2026-06-17.

References

https://github.com/skoruba/IdentityServer4.Admin/issues/813

Affected products (1)

cpe:2.3:a:identityserver4.admin_project:identityserver4.admin:*:*:*:*:*:*:*:*

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