CVE-2021-28290: A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value p

Q: How do I fix CVE-2021-28290?

identityserver4.admin: upgrade to 2.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-28290 being exploited?

CVE-2021-28290 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-28290 affect?

CVE-2021-28290 affects identityserver4.admin. Severity is medium (CVSS 6.1). A cross-site scripting (XSS) vulnerability in Skoruba IdentityServer4.Admin before 2.0.0 via unencoded value passed to the data-secret-value parameter.

Q: How urgent is CVE-2021-28290?

Priority 39/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2021-28290 is a medium-severity flaw (CVSS 6.1) affecting identityserver4.admin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-05-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: identityserver4.admin project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-05-11 18:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

identityserver4.admin project identityserver4.admin UPGRADE

Affected: < 2.0.0

Fixed in: 2.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy identityserver4.admin || rpm -q identityserver4.admin || identityserver4.admin --version

2. UPGRADE to 2.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade identityserver4.admin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade identityserver4.admin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-28290?

identityserver4.admin: upgrade to 2.0.0. Exact commands for each OS are on this page.

Is CVE-2021-28290 being exploited?

CVE-2021-28290 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-28290 affect?

CVE-2021-28290 affects identityserver4.admin. Severity is medium (CVSS 6.1). 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 urgent is CVE-2021-28290?

Priority 39/100. Public exploit reference

References

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